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(3/5)*x-((1/10)*x) = x-(15/2) // - x-(15/2)
(3/5)*x-((1/10)*x)-x+15/2 = 0
(3/5)*x+(-1/10)*x-x+15/2 = 0
15/2-1/2*x = 0 // - 15/2
-1/2*x = -15/2 // : -1/2
x = -15/2/(-1/2)
x = 15
x = 15
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