Решите уравнения15*(a-4)=42+8*(a-4)(y+1)*18=36+12*(y+1)

Question

Решите уравнения

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

Answer 1

15*(a-4)=42+8*(a-4)
15a-60=42+8a-32
15a-8a=60+42-32
7a=70
a=70:7
a=10
Ответ:a=10.
(у+1)*18=36+12*(у+1)
18у+18=36+12у+12
18у-12у=36+12-18
6у=30
у=30:6
у=5
Ответ:у=5

Answer 2

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