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(-1/6)*(x-12)+(2/6)*(x+3) = x+3 // - x+3
(-1/6)*(x-12)+(2/6)*(x+3)-x-3 = 0
1/3*(x+3)-1/6*(x-12)-x-3 = 0
1/3*(x+3)-1/6*(x-12)-x-3 = 0
1/6*x-x-3+3 = 0
3-5/6*x-3 = 0
-5/6*x = 0
(-5*x)/6 = 0
(-5*x)/6 = 0 // * 6
-5*x = 0
-5*x = 0 // : -5
x = 0
x = 0
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