5m + 3 = 3m + 9
m = 3
6x - 2 = x + 13
x = 3
4(x + 5) = 6x
x = 10
3(2x + 1) = 8x - 21
x = 12
3(5y + 6) = 2(4y - 5)
y = -4
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