Question

17-12(х+1)=9-3х //////////

Answer 1

17-12(х+1)=9-3х
17-12х-12=9-3х
-12х+3х=9+12-17
-9х=4
х=-4/9
проверка
17-12(-4/9+1)=9-3*(-4/9)
17-12*5/9=9+3*4/9
17-6 2/3=9+1 1/3
10 1/3=10 1/3

Answer 2

с проверкой

Answer 3

обнови страницу, добавил проверку