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b in (-oo:+oo)
(3/2)*b = 63/4 // - 63/4
(3/2)*b-(63/4) = 0
(3/2)*b-63/4 = 0
3/2*b-63/4 = 0 // + 63/4
3/2*b = 63/4 // : 3/2
b = 63/4/3/2
b = 21/2
b = 21/2
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