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18 = (1/3)*(3*x-6) // - (1/3)*(3*x-6)
18-((1/3)*(3*x-6)) = 0
(-1/3)*(3*x-6)+18 = 0
18-1/3*(3*x-6) = 0
18-1/3*(3*x-6) = 0
20-x = 0
20-x = 0
20-x = 0 // - 20
-x = -20 // * -1
x = 20
x = 20
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