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(5*x-12)/3-4 = (9-(3*x))/5-x // - (9-(3*x))/5-x
(5*x-12)/3-((9-(3*x))/5)+x-4 = 0
(5*x-12)/3-((9-3*x)/5)+x-4 = 0
(5*x-12)/3+(-1*(9-3*x))/5+x-4 = 0
(5*(5*x-12))/(3*5)+(-1*3*(9-3*x))/(3*5)+(3*5*x)/(3*5)+(-4*3*5)/(3*5) = 0
5*(5*x-12)-1*3*(9-3*x)+3*5*x-4*3*5 = 0
34*x+15*x-87-60 = 0
49*x-87-60 = 0
49*x-147 = 0
(49*x-147)/(3*5) = 0
(49*x-147)/(3*5) = 0 // * 3*5
49*x-147 = 0
49*x-147 = 0 // + 147
49*x = 147 // : 49
x = 147/49
x = 3
x = 3
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