Question

Tìm x thuộc Z , biết ; 5(2x+3)-7x=0

 

Answer 1

\(5.\left(2x+3\right)-7x=0\)

\(\Rightarrow10x+15-7x=0\)

\(\Rightarrow\left(10x-7x\right)+15=0\)

\(\Rightarrow3x=-15\)

\(\Rightarrow x=-5\)

Vậy \(x=-5\)

Answer 2

\(5\left(2x+3\right)-7x=0\)

\(\Leftrightarrow10x+15-7x=0\)

\(\Leftrightarrow3x=-15\)

\(\Leftrightarrow x=-5\)

Answer 3

\(5\left(2x+3\right)-7x=0\)

\(\Leftrightarrow10x+15-7x=0\)

\(\Leftrightarrow3x+15=0\)

\(\Leftrightarrow3x=-15\)

\(\Leftrightarrow x=-5\)

vậy x=-5