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5/7-x = 61/7-5*x // - 61/7-5*x
5/7-x-(-5*x)-(61/7) = 0
5*x-x+5/7-61/7 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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