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(5/6)*x+2/3 = 5/7 // - 5/7
(5/6)*x+2/3-(5/7) = 0
(5/6)*x+2/3-5/7 = 0
5/6*x-1/21 = 0 // + 1/21
5/6*x = 1/21 // : 5/6
x = 1/21/5/6
x = 2/35
x = 2/35
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