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b in (-oo:+oo)
(-3/4)*b+5 = 7/2 // - 7/2
(-3/4)*b-(7/2)+5 = 0
(-3/4)*b-7/2+5 = 0
3/2-3/4*b = 0 // - 3/2
-3/4*b = -3/2 // : -3/4
b = -3/2/(-3/4)
b = 2
b = 2
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