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