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(2/7)*x+5 = 71/14 // - 71/14
(2/7)*x-(71/14)+5 = 0
(2/7)*x-71/14+5 = 0
2/7*x-1/14 = 0 // + 1/14
2/7*x = 1/14 // : 2/7
x = 1/14/2/7
x = 1/4
x = 1/4
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