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(3/8)*x-(1/5)+10 = (3/10)*x // - (3/10)*x
(3/8)*x-((3/10)*x)-(1/5)+10 = 0
(3/8)*x+(-3/10)*x-1/5+10 = 0
3/40*x+49/5 = 0 // - 49/5
3/40*x = -49/5 // : 3/40
x = -49/5/3/40
x = -392/3
x = -392/3
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