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(1/2)*(6*x-4)-(4*x) = 3*x-18 // - 3*x-18
(1/2)*(6*x-4)-(4*x)-(3*x)+18 = 0
(1/2)*(6*x-4)-4*x-3*x+18 = 0
1/2*(6*x-4)-4*x-3*x+18 = 0
1/2*(6*x-4)-4*x-3*x+18 = 0
18-x-3*x-2 = 0
18-4*x-2 = 0
16-4*x = 0
16-4*x = 0
16-4*x = 0 // - 16
-4*x = -16 // : -4
x = -16/(-4)
x = 4
x = 4
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