Question

\(\left(\frac{3x}{7}+1\right)=\frac{-1}{28}.\left(-4\right)\)

Answer 1

\(\left(\frac{3x}{7}+1\right)=\frac{-1}{28}.\left(-4\right)\)

\(\left(\frac{3x}{7}+1\right)=\frac{1}{7}\)

\(\frac{3x}{7}=\frac{1}{7}-1\)

\(\frac{3x}{7}=\frac{-6}{7}\)

=> 3x = -6

=> x   = -6 : 3

=> x   = -2

Vậy x = -2

Answer 2

\(\left(\frac{3x}{7}+1\right)=\frac{-1}{28}.\left(-4\right)\)

\(\left(\frac{3x}{7}+1\right)=\frac{1}{7}\)

\(\frac{3x}{7}=\frac{1}{7}-1=\frac{-6}{7}\)

\(3x=-6\)

\(=>x=\left(-6\right):3=-2\)

Answer 3

\(\left(\frac{3x}{7}+1\right)=\frac{-1}{28}.\left(-4\right)\)

\(\Rightarrow\left(\frac{3x+7}{7}\right)=\frac{1}{7}\)

=> 3x+7=1

=>3x=-6

=>x=-2