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b in (-oo:+oo)
(-3/4)*b+3/4 = 89/2-(7*b) // - 89/2-(7*b)
(-3/4)*b+7*b+3/4-(89/2) = 0
(-3/4)*b+7*b+3/4-89/2 = 0
25/4*b-175/4 = 0 // + 175/4
25/4*b = 175/4 // : 25/4
b = 175/4/25/4
b = 7
b = 7
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