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(4/9)*x-12 = (-1/6)*(x-12)-3 // - (-1/6)*(x-12)-3
(4/9)*x-((-1/6)*(x-12))-12+3 = 0
(1/6)*(x-12)+(4/9)*x-12+3 = 0
1/6*(x-12)+(4*x)/9-12+3 = 0
(1/6*9*(x-12))/9+(4*x)/9+(-12*9)/9+(3*9)/9 = 0
1/6*9*(x-12)+4*x-12*9+3*9 = 0
11/2*x-108-18+27 = 0
11/2*x-126+27 = 0
11/2*x-99 = 0
(11/2*x-99)/9 = 0
(11/2*x-99)/9 = 0 // * 9
11/2*x-99 = 0
11/2*x-99 = 0 // + 99
11/2*x = 99 // : 11/2
x = 99/11/2
x = 18
x = 18
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