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b in (-oo:+oo)
(-3/5)*b-3 = -3/5 // + -3/5
(-3/5)*b-(-3/5)-3 = 0
(-3/5)*b+3/5-3 = 0
-3/5*b-12/5 = 0 // + 12/5
-3/5*b = 12/5 // : -3/5
b = 12/5/(-3/5)
b = -4
b = -4
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