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(2*x)/7+4/7 = 8 // - 8
(2*x)/7+4/7-8 = 0
2/7*x-52/7 = 0 // + 52/7
2/7*x = 52/7 // : 2/7
x = 52/7/2/7
x = 26
x = 26
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