Question

19(y-9)=3(y+7) решите с проверкой

Answer 1

19y-171=3y+21
19y-3y=21+171
16y=192
y=192/16y=12
ПРОВЕРКА:
19(12-9)=3(12+7)
228-171=36+21
57=57

Answer 2

19(y-9)=3(y+7) ; 19у-171=3у+21; 19у-3у=21+171; 16у=192; у=192:16; у=12; Проверка: 19(12-9)=3(12+7); 57=57