1 + 6r = 15 - r
r = 2
-5(4x - 2) = -2(3 + 6x)
x = 2
5(2x + 6) = 3x - 4(-5 -2x)
x = 10
-4 - 4(-x - 1) = -4(6 + 2x)
x = -2
4(4x + 4) - 4(8 + 3x) = -24 + 2(x - 2)
x = -6
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