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(1/2)*(x+3)+6*x = (1/3)*(12*x+3) // - (1/3)*(12*x+3)
(1/2)*(x+3)-((1/3)*(12*x+3))+6*x = 0
(1/2)*(x+3)+(-1/3)*(12*x+3)+6*x = 0
1/2*(x+3)-1/3*(12*x+3)+6*x = 0
1/2*(x+3)-1/3*(12*x+3)+6*x = 0
6*x-7/2*x+1/2 = 0
5/2*x+1/2 = 0
5/2*x+1/2 = 0
5/2*x+1/2 = 0 // - 1/2
5/2*x = -1/2 // : 5/2
x = -1/2/5/2
x = -1/5
x = -1/5
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