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(1/2)*(4*x-12) = 2*(x-3) // - 2*(x-3)
(1/2)*(4*x-12)-(2*(x-3)) = 0
(1/2)*(4*x-12)-2*(x-3) = 0
1/2*(4*x-12)-2*(x-3) = 0
1/2*(4*x-12)-2*(x-3) = 0
0 = 0
0 = 0
x belongs to the empty set
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