Question

25а-1,4=-12а-3,2 и ещё 1

(у-3):4=(5-2у):(-9)

Answer 1

$1.) frac{2}{5}cdot a - 1,4 = frac{1}{2}cdot a - 3,2\\ frac{2a}{5}-frac{a}{2}=-3,2+1,4\\ a (frac{2}{5}-frac{1}{2})=-1,8\\ a(frac{4}{10}-frac{5}{10})=-1,8\\ acdot (-0,1) = -1,8\\ a = frac{-1,8}{-0,1}\\ a = 18$

 

$2.) frac{y-3}{4}=frac{5-2y}{-9}\\ frac{9(y-3)}{36}=frac{-4(5-2y)}{36}\\ 9(y-3)=-4(5-2y)\\ 9y-27=-20+8y\\ 9y-8y=-20+27\\ y=7$