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b in (-oo:+oo)
-(4*b)-10 = 4*b+6 // - 4*b+6
-(4*b)-(4*b)-10-6 = 0
-4*b-4*b-10-6 = 0
-8*b-16 = 0 // + 16
-8*b = 16 // : -8
b = 16/(-8)
b = -2
b = -2
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