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3p + p = 17 - 5
4p = 12
p = 12/4 = 3
5(y - 2) = 4y - 7
5y - 10 = 4y - 7
5y - 4y = - 7 + 10
y = 3
4(3 - 2y) = 15 - 7y
12 - 8y = 15 - 7y
- 8y + 7y = 15 - 12
- y = 3
y = - 3