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(6*(x-2))/4 = (3*(x+9))/13 // - (3*(x+9))/13
(6*(x-2))/4-((3*(x+9))/13) = 0
(6*(x-2))/4+(-3/13)*(x+9) = 0
(6*(x-2))/4-3/13*(x+9) = 0
(6*(x-2))/4+(-3/13*4*(x+9))/4 = 0
6*(x-2)-3/13*4*(x+9) = 0
66/13*x-264/13 = 0
(66/13*x-264/13)/4 = 0
(66/13*x-264/13)/4 = 0 // * 4
66/13*x-264/13 = 0
66/13*x-264/13 = 0 // + 264/13
66/13*x = 264/13 // : 66/13
x = 264/13/66/13
x = 4
x = 4
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