Question

tim x 

7x .( 2+ x ) - 7x .( x+ 3) = 14

 

Answer 1

7x ( 2 + x - x - 3 ) = 14

-7x = 14

x = -2 

Answer 2

\(7x\left(2+x\right)-7x\left(x+3\right)=14\)

\(\Rightarrow7x\left[\left(2+x\right)-\left(x+3\right)\right]=14\)

\(\Rightarrow7x\left[2+x-x-3\right]=14\)

\(\Rightarrow7x.\left(-1\right)=14\)

\(\Rightarrow-7x=14\)

\(\Rightarrow x=14:-7\)

\(\Rightarrow x=-2\)

Vậy x = -2

_Chúc bạn học tốt_