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(1/3)*x-((1/6)*x)+3+12 = x-7 // - x-7
(1/3)*x-((1/6)*x)-x+3+7+12 = 0
(-1/6)*x+(1/3)*x-x+3+7+12 = 0
22-5/6*x = 0 // - 22
-5/6*x = -22 // : -5/6
x = -22/(-5/6)
x = 132/5
x = 132/5
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