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b in (-oo:+oo)
-7 = b/4-1 // - b/4-1
1-(b/4)-7 = 0
-1/4*b-6 = 0 // + 6
-1/4*b = 6 // : -1/4
b = 6/(-1/4)
b = -24
b = -24
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