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(1/6)*x-(2/7) = 4/7 // - 4/7
(1/6)*x-(2/7)-(4/7) = 0
(1/6)*x-2/7-4/7 = 0
1/6*x-6/7 = 0 // + 6/7
1/6*x = 6/7 // : 1/6
x = 6/7/1/6
x = 36/7
x = 36/7
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