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b in (-oo:+oo)
-(2*b)-(7*b)-10 = -1 // + 1
1-(2*b)-(7*b)-10 = 0
1-2*b-7*b-10 = 0
-9*b-9 = 0 // + 9
-9*b = 9 // : -9
b = 9/(-9)
b = -1
b = -1
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