\(\frac{-3x-15}{-2x}=3\)
mà âm chia âm bằng dương
=>\(\frac{-3x-15}{-2x}=\frac{-\left(3x+15\right)}{-\left(2x\right)}=\frac{3x+15}{2x}=3\)
\(\frac{3x}{2x}+\frac{15}{2x}=3\)=>\(\frac{3}{2}+\frac{15}{2x}=3\)
\(15:2x=3-\frac{3}{2}=\frac{6-3}{2}=\frac{3}{2}\)
\(15.\frac{1}{2}x=\frac{3}{2}\)=>\(\frac{15}{2}x=\frac{3}{2}\)
\(x=\frac{3}{2}:\frac{15}{2}=\frac{3}{2}.\frac{2}{15}=\frac{1}{5}\)