Question

tìm x

-12 ( x - 5 ) + 7 ( 3 - x ) = 5

Answer 1

\(-12\left(x-5\right)+7\left(3-x\right)=5\)

\(\Rightarrow-12x+60+21-7x=5\)

\(\Rightarrow-19x+81=5\)

\(\Rightarrow-19x=-76\Rightarrow x=4\)

Vậy \(x=4\)

Chúc học tốt !!!

Answer 2

\(-12\left(x-5\right)+7\left(3-x\right)=5\\ \Leftrightarrow-12x+60+21-7x=5\\ \Leftrightarrow-12x-7x=5-60-21\\ \Leftrightarrow-19x=76\\ \Leftrightarrow x=-4\)

Vậy \(x=-4\)

Answer 3

-12(x-5)+7(3-x)=5\(\Rightarrow\)-12x+60+21-7x=5\(\Rightarrow\)(-12x-7x)+(60+21)=5\(\Rightarrow\)-19x+81=5\(\Rightarrow\)-19x=5-81\(\Rightarrow\)-19x=-76\(\Rightarrow\)x=-76:(-19) x=-4 .chuc ban hoc tot