\(2\left(x-\frac{1}{2}\right)-5\left(\frac{3}{10}-1\right)=7\)
\(\Rightarrow\left(2x-1\right)-\left(\frac{3}{2}-5\right)=7\)
\(\Rightarrow\left(2x-1\right)-\frac{-7}{2}=7\)
\(\Rightarrow\left(2x-1\right)=7+\frac{-7}{2}=\frac{7}{2}\)
\(\Rightarrow2x=\frac{7}{2}+1\)
\(\Rightarrow x=\frac{9}{2}:2\)
\(\Rightarrow x=\frac{9}{4}\)
2(x-1/2)-5(3/10-1)=7
2x-1-3/2+5=7
2x=7+1+3/2-5
2x=9/2
x=9/4
Vậy x=9/4.