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b in (-oo:+oo)
(3/28)*b = 9/4 // - 9/4
(3/28)*b-(9/4) = 0
(3/28)*b-9/4 = 0
3/28*b-9/4 = 0 // + 9/4
3/28*b = 9/4 // : 3/28
b = 9/4/3/28
b = 21
b = 21
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