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(10/4)*x-(5*x)-(15/10)-8 = 0
(10/4)*x-5*x-3/2-8 = 0
-5/2*x-19/2 = 0 // + 19/2
-5/2*x = 19/2 // : -5/2
x = 19/2/(-5/2)
x = -19/5
x = -19/5
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