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(5/7)*(x-(1/7))+x = 0
(5/7)*(x-1/7)+x = 0
5/7*(x-1/7)+x = 0
5/7*(x-1/7)+x = 0
12/7*x-5/49 = 0
12/7*x-5/49 = 0
12/7*x-5/49 = 0 // + 5/49
12/7*x = 5/49 // : 12/7
x = 5/49/12/7
x = 5/84
x = 5/84
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