Question

tìm x thỏa mãn -12*(x-5)+7*(3-x)=5

Answer 1

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

<=> -12x+60+21-7x=5

<=> -19x+81=5

<=> -19x= -76

<=> x= 4

Answer 2

Ta có: \(-12.\left(x-5\right)+7.\left(3-x\right)=5\)

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

\(\Rightarrow\left(-19\right).x=5-21-60\)

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

\(\Rightarrow x=4\)