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30 = (-5*x)/2 // - (-5*x)/2
30-((-5*x)/2) = 0
(5/2)*x+30 = 0
5/2*x+30 = 0 // - 30
5/2*x = -30 // : 5/2
x = -30/5/2
x = -12
x = -12
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