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(1/10)*x = 10-((1/40)*x) // - 10-((1/40)*x)
(1/10)*x+(1/40)*x-10 = 0
1/8*x-10 = 0 // + 10
1/8*x = 10 // : 1/8
x = 10/1/8
x = 80
x = 80
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