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5*x+6/7 = 216/7 // - 216/7
5*x+6/7-(216/7) = 0
5*x+6/7-216/7 = 0
5*x-30 = 0 // + 30
5*x = 30 // : 5
x = 30/5
x = 6
x = 6
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