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(3/5)*(3*x+12) = 3*(4-(4*x))+9 // - 3*(4-(4*x))+9
(3/5)*(3*x+12)-(3*(4-(4*x)))-9 = 0
(3/5)*(3*x+12)-3*(4-4*x)-9 = 0
3/5*(3*x+12)-3*(4-4*x)-9 = 0
3/5*(3*x+12)-3*(4-4*x)-9 = 0
69/5*x-9-24/5 = 0
69/5*x-69/5 = 0
69/5*x-69/5 = 0
69/5*x-69/5 = 0 // + 69/5
69/5*x = 69/5 // : 69/5
x = 69/5/69/5
x = 1
x = 1
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