Question

решить уравнения: 1. 25-3у=9-5у 2. 12-2·(х+3)=26

Answer 1

$25 - 9 = 5y + 3y \ 16 - 5 - 3 = y + y \ 9 = y+ y \ 9+2=y\11=y\\ 12 - 2x - 6 = 26 \ 12 - 2 - 6 - 26 = - x \ 12 - 8 - 26 = - x \ - 22 = - x \ 22 = x$