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x in (-oo:+oo)
(1/2)*(x-4) = -8 // + 8
(1/2)*(x-4)+8 = 0
1/2*(x-4)+8 = 0
1/2*(x-4)+8 = 0
1/2*x+6 = 0
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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