Решить уравнение a) -20*(x-13)=-220 b) (30-7x)*8=352 c) (2,8-0,1x)*3,7=7,4 d)...

Решите задачу:

$1)-20*(x-13)=-220\\x-13= \frac{-220}{-20} \\x-13=11\\x=11+13\\x=24 \\ \\ 2)(30-7x)*8=352\\30-7x=352/8\\30-7x=44\\7x=30-44\\7x=-14\\x=-2\\\\$
$3)(2.8-0.1x)*3.7=7.4\\2.8-0.1x=7.4/3.7\\2.8-0.1x=2/*10\\28-x=20\\x=28-20\\x=8\\\\$
$4) \frac{5}{12} y- \frac{1}{4} = \frac{1}{2} \\ \frac{5}{12} y= \frac{1}{2} + \frac{1}{4} \\ \\ \frac{5}{12} y= \frac{2+1}{4} \\ \\ \frac{5}{12}y = \frac{3}{4} \\y= \frac{3}{4} : \frac{5}{12} \\ \\y= \frac{5*12}{4*5} \\ \\ y=3$