Question

1)9х-8=4х+ 12 помогите решить
2)9-7(х+3)=5-4х

Answer 1

9х - 8 = 4х + 12
9х - 4х = 12 + 8
5х = 20
х = 20/5
х = 5

9 - 7*(х - 3) = 5 - 4х
9 - 7х - 21 = 5 - 4х
-7х + 4х = 5 - 9 + 21
-3х = 17
х = 17/(-3)
х = 5 2/3