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(1/2)*(3*x+3) = 3*(2-(3*x))+6 // - 3*(2-(3*x))+6
(1/2)*(3*x+3)-(3*(2-(3*x)))-6 = 0
(1/2)*(3*x+3)-3*(2-3*x)-6 = 0
1/2*(3*x+3)-3*(2-3*x)-6 = 0
1/2*(3*x+3)-3*(2-3*x)-6 = 0
21/2*x-6-9/2 = 0
21/2*x-21/2 = 0
21/2*x-21/2 = 0
21/2*x-21/2 = 0 // + 21/2
21/2*x = 21/2 // : 21/2
x = 21/2/21/2
x = 1
x = 1
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