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-30 = (-5/8)*x // - (-5/8)*x
-((-5/8)*x)-30 = 0
(5/8)*x-30 = 0
5/8*x-30 = 0 // + 30
5/8*x = 30 // : 5/8
x = 30/5/8
x = 48
x = 48
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