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b in (-oo:+oo)
-1 = (3/4)*b-2.2 // - (3/4)*b-2.2
2.2-((3/4)*b)-1 = 0
(-3/4)*b-1+2.2 = 0
1.2-3/4*b = 0 // - 1.2
-3/4*b = -1.2 // : -3/4
b = -1.2/(-3/4)
b = 1.6
b = 1.6
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