Question

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

xl mk nhầm

 

Answer 1

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

\(\Leftrightarrow-12x-\left(-60\right)+21-7x=5\)

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

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

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

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

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

\(\Rightarrow x=-76:\left(-19\right)\)

\(\Rightarrow x=4\)

Vậy x=4

Answer 2

thanks nha

Answer 3

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

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

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

\(-19x=-76\)

\(x=4\)