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-30 = (-5/6)*x // - (-5/6)*x
-((-5/6)*x)-30 = 0
(5/6)*x-30 = 0
5/6*x-30 = 0 // + 30
5/6*x = 30 // : 5/6
x = 30/5/6
x = 36
x = 36
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