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b in (-oo:+oo)
-((3/7)*b)-4-2 = 0
(-3/7)*b-4-2 = 0
-3/7*b-6 = 0 // + 6
-3/7*b = 6 // : -3/7
b = 6/(-3/7)
b = -14
b = -14
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