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b in (-oo:+oo)
3.75 = (3/4)*(b-4) // - (3/4)*(b-4)
3.75-((3/4)*(b-4)) = 0
(-3/4)*(b-4)+3.75 = 0
3.75-3/4*(b-4) = 0
3.75-3/4*(b-4) = 0
6.75-3/4*b = 0
6.75-3/4*b = 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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