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= 5y - 5 = 4y
= 5y - 4y = 5
= y = 5
2. 4 ( 3 - 2y ) = 15 - 7y
= 12 - 8y = 15 - 7y
= - 8y + 7y = 15 - 12
= - y = 3
= - y = - 3
y = 5
- 12 - 8y = 15-7y
7y - 8y = 15 - 12
-y = 3
y = -3