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(3*x)/7 = 1-((2/5)*x)-(10/15) // - 1-((2/5)*x)-(10/15)
(3*x)/7+(2/5)*x+10/15-1 = 0
29/35*x-1/3 = 0 // + 1/3
29/35*x = 1/3 // : 29/35
x = 1/3/29/35
x = 35/87
x = 35/87
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