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b in (-oo:+oo)
6.75 = (3/4)*b // - (3/4)*b
6.75-((3/4)*b) = 0
(-3/4)*b+6.75 = 0
6.75-3/4*b = 0 // - 6.75
-3/4*b = -6.75 // : -3/4
b = -6.75/(-3/4)
b = 9
b = 9
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