Question

[Phạm Trà My]

tìm x

a. 6-(15+15)=x-(15-6)

b. x+4/12=3/-9

Answer 1

[Gukmin]

\(a)\)\(6-\left(15+15\right)=x-\left(15-6\right)\)

\(\Leftrightarrow6-30=x-9\)

\(\Leftrightarrow-24=x-9\)

\(\Leftrightarrow x=-24+9\)

\(\Leftrightarrow x=-15\)

Vậy\(x=-15\)

\(b)\)\(x+\frac{4}{12}=\frac{3}{-9}\)

\(\Leftrightarrow x+\frac{1}{3}=-\frac{1}{3}\)

\(\Leftrightarrow x=-\frac{1}{3}-\frac{1}{3}\)

\(\Leftrightarrow x=-\frac{2}{3}\)

Vậy\(x=\frac{-2}{3}\)

Linz

Answer 2

[๖²⁴ʱ๖ۣۜTɦủү❄吻༉]

a, \(6-\left(15+15\right)=x-\left(15-6\right)\)

\(\Leftrightarrow6-30=x-9\Leftrightarrow15=x+30\Leftrightarrow x=-15\)

b, \(\frac{x+4}{12}=\frac{3}{-9}\)

\(\Leftrightarrow-9x-36=36\Leftrightarrow-9x=72\Leftrightarrow x=-8\)