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