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b in (-oo:+oo)
4.1 = b/4 // - b/4
4.1-(b/4) = 0
4.1-1/4*b = 0 // - 4.1
-1/4*b = -4.1 // : -1/4
b = -4.1/(-1/4)
b = 16.4
b = 16.4
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