Решите.9 -7у =2,5-3у пжжжжжжжжжжжжжжж
9-7у=2.5-3у 9-2.5=-3у+7у 6.5=4у у=6.5:4 у=1.625
9-7y=2,5-3y 9-2,5=-3y+7y 6,5=4y y=6,5/4 y=1,625