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x in (-oo:+oo)
(1/2)*(x-4) = (1/3)*x // - (1/3)*x
(1/2)*(x-4)-((1/3)*x) = 0
(1/2)*(x-4)+(-1/3)*x = 0
1/2*(x-4)-x/3 = 0
(1/2*3*(x-4))/3-x/3 = 0
1/2*3*(x-4)-x = 0
1/2*x-6 = 0
(1/2*x-6)/3 = 0
(1/2*x-6)/3 = 0 // * 3
1/2*x-6 = 0
1/2*x-6 = 0 // + 6
1/2*x = 6 // : 1/2
x = 6/1/2
x = 12
x = 12
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