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(3*x+9)/6 = (2*x-6)/6 // - (2*x-6)/6
(3*x+9)/6-((2*x-6)/6) = 0
(3*x+9)/6+(-1*(2*x-6))/6 = 0
3*x-1*(2*x-6)+9 = 0
x+15 = 0
(x+15)/6 = 0
(x+15)/6 = 0 // * 6
x+15 = 0
x+15 = 0 // - 15
x = -15
x = -15
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