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(7*x+2)/6+(9*x+1)/3 = 9 // - 9
(7*x+2)/6+(9*x+1)/3-9 = 0
(3*(7*x+2))/(3*6)+(6*(9*x+1))/(3*6)+(-9*3*6)/(3*6) = 0
3*(7*x+2)+6*(9*x+1)-9*3*6 = 0
75*x-162+12 = 0
75*x-150 = 0
(75*x-150)/(3*6) = 0
(75*x-150)/(3*6) = 0 // * 3*6
75*x-150 = 0
75*x-150 = 0 // + 150
75*x = 150 // : 75
x = 150/75
x = 2
x = 2
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