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\(2^{x+3}.4^2=64\Leftrightarrow2^{x+3}.2^4=64\Leftrightarrow2^{x+7}=2^6\Leftrightarrow x+7=6\Leftrightarrow x=-1\)

a) 123-3x=24
3x=123-24
3x=99
x=99:3
x=33
Vậy x=33.
b) (x-36):12=6
x-36=6.12
x-36=72
x=72+36
x=108
Vậy x=108.

1)
a: (36-16).(-5)+6.(-14-6)
=20.(-5)+6.(-20)
=20.(-5)+(-6).20
=20.(-5+-6)
=20.(-11)
=-220
2)
a/x+(-23)=(-100)+77
x+(-23)=-23
x=(-23)+(-23)
x=0
Vậy x=0

x + 6 chia hết cho x + 3
=> x + 3 + 3 chia hết cho x + 3
=> 3 chia hết cho x + 3
=> (x + 3) \(\in\) Ư(3)
=> (x + 3) \(\in\) {-3; -1; 1; 3}
=> x \(\in\) {-6; -4; -2; 0}

Ta có:\(\left(-12\right)+\left(-13\right)+36+\left(-11\right)=\left(-12-13-11\right)+36\)
\(=\left(-36\right)+36\)
\(=0\)

a) \(3\left(x-5\right)+6=36\)
\(\Rightarrow3\cdot\left(x-5\right)=36-6\)
\(\Rightarrow3\cdot\left(x-5\right)=30\)
\(\Rightarrow x-5=10\)
\(\Rightarrow x=10+5\)
\(\Rightarrow x=15\)
b) \(200-8\cdot\left(x+7\right)=24\)
\(\Rightarrow8\cdot\left(x+7\right)=200-24\)
\(\Rightarrow8\cdot\left(x+7\right)=176\)
\(\Rightarrow x+7=\dfrac{176}{8}\)
\(\Rightarrow x+7=22\)
\(\Rightarrow x=22-7\)
\(\Rightarrow x=15\)
c) \(\left(x-890\right)\left(74-x\right)=0\)
+) \(x-890=0\)
\(\Rightarrow x=890\)
+) \(74-x=0\)
\(\Rightarrow x=74\)
d) \(\left(31-x\right)\cdot\left(x-64\right)=0\)
+) \(31-x=0\)
\(\Rightarrow x=31\)
+) \(x-64=0\)
\(\Rightarrow x=64\)

a) X - 36 x 18 = 12
X - 36 = 12 : 18
X - 36 = 2/3
X = 2/3 + 36
X = \(36\frac{2}{3}\)
b) ( X - 36 ) : 18 = 12
X - 36 = 12 x 18
X - 38 = 216
X = 216 + 38
X = 254
( 15.x + 36 ) : 6 - 12 = 54
= ( 15.x + 36 ) : 6 = 54 + 12
= ( 15.x + 36 ) : 6 = 66
= 15.x + 36 = 66 x 6
= 15.x + 36 = 396
= 15 . x = 396 - 36
= 15 . x = 360
= x = 360 : 15
= x = 24
( 15.x + 36 ) : 6 - 12 = 54
( 15.x + 36 ) : 6 = 54 + 12
( 15.x + 36 ) : 6 = 66
15.x + 36 = 66 x 6
15.x + 36 = 396
15.x = 396 - 36
15.x = 360
x = 360 : 15
x = 24