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