Решите уравнение под а) 25.7

$\frac{3}{4} y-( \frac{5}{6} y-1,25)=0,55$
$\frac{3}{4} y- \frac{5}{6} y+1,25= \frac{55}{100}$
$\frac{3}{4} y- \frac{5}{6} + \frac{125}{100} = \frac{11}{20}$
$\frac{3}{4} y- \frac{5}{6} y+ \frac{5}{4} = \frac{11}{20}$
$60* \frac{3}{4} y-60* \frac{5}{6} y+60* \frac{5}{4} =60* \frac{11}{20}$
$15*3y-10*5y+15*5=3*11$
$45y-50y+75=33$
$-5y+75=33$
$-5y=33-75$
$-5y=-42$
$y= \frac{42}{5} =8 \frac{2}{5} =8,4$
Ответ: 8,4.