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2/7 = (5/7)*x-(7*x)+5 // - (5/7)*x-(7*x)+5
7*x-((5/7)*x)+2/7-5 = 0
(-5/7)*x+7*x+2/7-5 = 0
44/7*x-33/7 = 0 // + 33/7
44/7*x = 33/7 // : 44/7
x = 33/7/44/7
x = 3/4
x = 3/4
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