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(5/7)*x+5/6 = 5/12 // - 5/12
(5/7)*x+5/6-(5/12) = 0
(5/7)*x+5/6-5/12 = 0
5/7*x+5/12 = 0 // - 5/12
5/7*x = -5/12 // : 5/7
x = -5/12/5/7
x = -7/12
x = -7/12
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