Question

2.(3-y)+7.(2-y)=15-4y

Answer 1

Olá, tudo bom?

2.(3-y)+7.(2-y)=15-4y
6-2y+14-7y= 15-4y
20-9y=15-4y
-9y+4y= 15-20
-5y= -5  (-1)
5y= 5
y= 5/5
y= 5

Espero ter ajudado!

Answer 2

2.(3-y) +7.(2-y)= 15 -4y

6 -2y + 14 -7y = 15 -4y

20 -9y = 15 -4y

20 -15 = -4y +9y

5 = + 5y

y = 5/5 = 1