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2*x+4*x-(5/7) = 3/7 // - 3/7
2*x+4*x-(5/7)-(3/7) = 0
2*x+4*x-5/7-3/7 = 0
6*x-8/7 = 0 // + 8/7
6*x = 8/7 // : 6
x = 8/7/6
x = 4/21
x = 4/21
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