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x in (-oo:+oo)
(1/2)*(2*x-6) = 4 // - 4
(1/2)*(2*x-6)-4 = 0
1/2*(2*x-6)-4 = 0
1/2*(2*x-6)-4 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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