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