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b in (-oo:+oo)
(-3/4)*b = 5 // - 5
(-3/4)*b-5 = 0
-3/4*b-5 = 0 // + 5
-3/4*b = 5 // : -3/4
b = 5/(-3/4)
b = -20/3
b = -20/3
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