Question

[Phạm Hoàng Linh]

tìm x:

8.(x-6)+4.(x-3)-2.(+7)=-x+4

-7.(8-x)-6.(9+x)=20-x

9.(x-7)-20.(4-3x)=-7x+15

-16.(6+x)-30.(2-x)=-40x-16

17.(x-6)-14.(x+2)=4.(x-6)-2.(x-2)

mn giải giúp mình vs ạ.Mình đang cần gấp!!!!

Answer 1

[Nguyễn Huy Tú]

\(8x-48+4x-12-14=-x+4\)

\(\Leftrightarrow12x-75=-x+4\Leftrightarrow13x=79\Leftrightarrow x=\dfrac{79}{13}\)

\(-7\left(8-x\right)-6\left(x+9\right)=20-x\Leftrightarrow-56+7x-6x-54=20-x\)

\(\Leftrightarrow2x=130\Leftrightarrow x=65\)

\(9x-63-80+60x=-7x+15\Leftrightarrow76x=158\Leftrightarrow x=\dfrac{79}{38}\)

\(-96-16x-60+30x=-40x-16\Leftrightarrow54x=140\Leftrightarrow x=\dfrac{70}{27}\)

\(17x-102-14x-28=4x-24-2x+4\Leftrightarrow x=110\)