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(6*x+1)/3 = (9-x)/7 // - (9-x)/7
(6*x+1)/3-((9-x)/7) = 0
(6*x+1)/3+(-1*(9-x))/7 = 0
(7*(6*x+1))/(3*7)+(-1*3*(9-x))/(3*7) = 0
7*(6*x+1)-1*3*(9-x) = 0
45*x-20 = 0
(45*x-20)/(3*7) = 0
(45*x-20)/(3*7) = 0 // * 3*7
45*x-20 = 0
45*x-20 = 0 // + 20
45*x = 20 // : 45
x = 20/45
x = 4/9
x = 4/9
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