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2*((5/7)*x-1) = (5/7)*x // - (5/7)*x
2*((5/7)*x-1)-((5/7)*x) = 0
2*((5/7)*x-1)+(-5/7)*x = 0
2*(5/7*x-1)+(-5*x)/7 = 0
(2*7*(5/7*x-1))/7+(-5*x)/7 = 0
2*7*(5/7*x-1)-5*x = 0
5*x-14 = 0
(5*x-14)/7 = 0
(5*x-14)/7 = 0 // * 7
5*x-14 = 0
5*x-14 = 0 // + 14
5*x = 14 // : 5
x = 14/5
x = 14/5
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