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b in (-oo:+oo)
(3*b)/7-5*b-(6/7)-5 = 0
(3*b)/7-5*b-6/7-5 = 0
-32/7*b-41/7 = 0 // + 41/7
-32/7*b = 41/7 // : -32/7
b = 41/7/(-32/7)
b = -41/32
b = -41/32
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