Question

15*(a-4)=42+8*(a-4)
(y+1)*18=36+12*(y+1)
Решите пожалуйста!

Answer 1

1) 15(a-4)=42+8(a-4)
15a-60=42+8a-32
15a-8=60+42-32
7a=70
a=10
2) (y+1)*18=36+12*(y+1)
18y+18=36+12y+12
18y-12y=36-18+12
6y=30
y=5

Answer 2

первое
15a-4=48+8*(a-4)
7a=20
7a-20=0
15a-4=8(a+2)
15a-4=8a+16
a=20/7 или 10

второе
(y+1)*18=36+12(y+1)
18y+18=12(y+1)+36
18y+18=12y+48
y=5