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(-1/6)*(x-12)+(1/3)*(x+3) = x-7 // - x-7
(-1/6)*(x-12)+(1/3)*(x+3)-x+7 = 0
1/3*(x+3)-1/6*(x-12)-x+7 = 0
1/3*(x+3)-1/6*(x-12)-x+7 = 0
1/6*x-x+3+7 = 0
3-5/6*x+7 = 0
10-5/6*x = 0
10-5/6*x = 0
10-5/6*x = 0 // - 10
-5/6*x = -10 // : -5/6
x = -10/(-5/6)
x = 12
x = 12
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