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