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(2/7)*x+5/7 = 6 // - 6
(2/7)*x+5/7-6 = 0
2/7*x-37/7 = 0 // + 37/7
2/7*x = 37/7 // : 2/7
x = 37/7/2/7
x = 37/2
x = 37/2
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