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(4*x-7)/3-((x-7)/5) = (x+6)/9 // - (x+6)/9
(4*x-7)/3-((x-7)/5)-((x+6)/9) = 0
(4*x-7)/3+(-1*(x-7))/5+(-1*(x+6))/9 = 0
(5*9*(4*x-7))/(3*5*9)+(-1*3*9*(x-7))/(3*5*9)+(-1*3*5*(x+6))/(3*5*9) = 0
5*9*(4*x-7)-1*3*9*(x-7)-1*3*5*(x+6) = 0
153*x-15*x-126-90 = 0
138*x-216 = 0
(138*x-216)/(3*5*9) = 0
(138*x-216)/(3*5*9) = 0 // * 3*5*9
138*x-216 = 0
138*x-216 = 0 // + 216
138*x = 216 // : 138
x = 216/138
x = 36/23
x = 36/23
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