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3*x+(6/7)*x+3/4 = 111/4 // - 111/4
3*x+(6/7)*x+3/4-(111/4) = 0
3*x+(6/7)*x+3/4-111/4 = 0
27/7*x-27 = 0 // + 27
27/7*x = 27 // : 27/7
x = 27/27/7
x = 7
x = 7
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