Question

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

Answer 1

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

Answer 2

2*(3-y)+7*(2-y)=15-4y
6-2y+14-7y=15-4y
20-9y=15-4y
20-9y-15+4y=0
5-5y=0
5y=5
y=5/5
y=1

Renato.