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(7*x-1)/5 = x // - x
(7*x-1)/5-x = 0
(7*x-1)/5+(5*(-x))/5 = 0
7*x+5*(-x)-1 = 0
2*x-1 = 0
(2*x-1)/5 = 0
(2*x-1)/5 = 0 // * 5
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x = 1/2
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