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6*x+(6/7)*x+1/3 = 439/21 // - 439/21
6*x+(6/7)*x+1/3-(439/21) = 0
6*x+(6/7)*x+1/3-439/21 = 0
48/7*x-144/7 = 0 // + 144/7
48/7*x = 144/7 // : 48/7
x = 144/7/48/7
x = 3
x = 3
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