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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
d) 8 - 2(3 - 4y) = 7y - 1
8 - 6 + 8y = 7y - 1
8y - 7y = - 1 - 2
y = -3
d) 5x + 7(3x + 2) = 6(4x+1)
5x + 21x + 14 = 24x + 6
26x - 24x = 6 -14
2x = - 8
x = -4