\(\left(\frac{5}{3}-x\right).\left(-\frac{12}{5}+\frac{3}{2}\right)=-12\frac{1}{2}\)
\(\left(\frac{5}{3}-x\right).\left(-\frac{9}{10}\right)=-\frac{25}{2}\)
\(\left(\frac{5}{3}-x\right)=-\frac{25}{2}:\left(-\frac{9}{10}\right)\)
\(\frac{5}{3}-x=\frac{125}{9}\)
\(x=\frac{5}{3}-\frac{125}{9}\)
\(x=-\frac{110}{9}\)
\(\left(\frac{5}{3}-x\right)\left(-\frac{15}{5}+\frac{3}{2}\right)=-12\frac{1}{2}\)
<=> \(\left(\frac{5}{3}-x\right).\left(-\frac{9}{10}\right)=-\frac{25}{2}\)
<=> \(\frac{5}{3}-x=\frac{125}{9}\)=> x=\(-\frac{45}{98}\)