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(1/3)*(x-12) = (-2/3)*x+9 // - (-2/3)*x+9
(1/3)*(x-12)-((-2/3)*x)-9 = 0
(1/3)*(x-12)+(2/3)*x-9 = 0
1/3*(x-12)+(2*x)/3-9 = 0
(1/3*3*(x-12))/3+(2*x)/3+(-9*3)/3 = 0
1/3*3*(x-12)+2*x-9*3 = 0
3*x-27-12 = 0
3*x-39 = 0
(3*x-39)/3 = 0
(3*x-39)/3 = 0 // * 3
3*x-39 = 0
3*x-39 = 0 // + 39
3*x = 39 // : 3
x = 39/3
x = 13
x = 13
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