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2*x+7 = 61/7 // - 61/7
2*x-(61/7)+7 = 0
2*x-61/7+7 = 0
2*x-12/7 = 0 // + 12/7
2*x = 12/7 // : 2
x = 12/7/2
x = 6/7
x = 6/7
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