Question

4-(5+y)+(7-2y)=4-5-y-7+2y
4+(5-y)-(7-2y)=4+5-y-7-2y

Answer 1

4-(5+у)+(7-2у)=4-5-y-7+2y
4-5-y+7-2y=-8+y
6-3y=-8+y
4y=14
y=14/4
y=3,5

4+(5-y)-(7-2y)=4+5-y-7-2y
4+5-y-7+2y=2-3y
2+y=2-3y
y+3y=2-2
4y=0
y=0/4
y=0