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