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(2/5)*x+3/7 = 1-((4/7)*x) // - 1-((4/7)*x)
(2/5)*x+(4/7)*x+3/7-1 = 0
34/35*x-4/7 = 0 // + 4/7
34/35*x = 4/7 // : 34/35
x = 4/7/34/35
x = 10/17
x = 10/17
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