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3x + 12 = - 5x - 36
3x + 5x = - 36 - 12
8x = - 48
x = -48/8
x = - 6
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5 (r + 6) = - 5 (r - 4)
5r + 30 = - 5r + 20
5r + 5r = 20 - 30
10r = - 10
y = -10/10
r = - 1
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9 (m - 6) = 4 (m + 4)
9m - 54 = 4m + 16
9m - 4m = 16 + 54
5m = 70
m = 70/5
m = 14