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5y - 5 = 4y
5y - 4y = 5
y = 5
b) 4(3-2y) = 15 - 7y
12 - 8y = 15 - 7y
-8y + 7y = 15 - 12
-y = 3
y = -3
c) 3(2y-3) = 5(y-2)
6y - 9 = 5y - 10
6y - 5y = -10 + 9
y = -1