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30-x/2 = -8*x // + -8*x
30-x/2-(-8*x) = 0
8*x-x/2+30 = 0
15/2*x+30 = 0 // - 30
15/2*x = -30 // : 15/2
x = -30/15/2
x = -4
x = -4
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