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b in (-oo:+oo)
16 = -b/4 // + -b/4
16-(-b/4) = 0
(1/4)*b+16 = 0
1/4*b+16 = 0 // - 16
1/4*b = -16 // : 1/4
b = -16/1/4
b = -64
b = -64
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