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(6/7)*x-4 = 13/7 // - 13/7
(6/7)*x-(13/7)-4 = 0
(6/7)*x-13/7-4 = 0
6/7*x-41/7 = 0 // + 41/7
6/7*x = 41/7 // : 6/7
x = 41/7/6/7
x = 41/6
x = 41/6
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