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(3/8)*x-((1/5)*x)+10 = (3/10)*x // - (3/10)*x
(3/8)*x-((1/5)*x)-((3/10)*x)+10 = 0
(3/8)*x+(-1/5)*x+(-3/10)*x+10 = 0
10-1/8*x = 0 // - 10
-1/8*x = -10 // : -1/8
x = -10/(-1/8)
x = 80
x = 80
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