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b in (-oo:+oo)
20 = 16-((1/4)*b) // - 16-((1/4)*b)
(1/4)*b-16+20 = 0
1/4*b+4 = 0 // - 4
1/4*b = -4 // : 1/4
b = -4/1/4
b = -16
b = -16
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