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10 = (-5*x)/2 // - (-5*x)/2
10-((-5*x)/2) = 0
(5/2)*x+10 = 0
5/2*x+10 = 0 // - 10
5/2*x = -10 // : 5/2
x = -10/5/2
x = -4
x = -4
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