Answer:
b = -3/2
Explanation:
b in (-oo:+oo)
(3/4)*b = -9/8 // + -9/8
(3/4)*b-(-9/8) = 0
(3/4)*b+9/8 = 0
3/4*b+9/8 = 0 // - 9/8
3/4*b = -9/8 // : 3/4
b = -9/8/3/4
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