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b in (-oo:+oo)
(21/5)*b = 49/4 // - 49/4
(21/5)*b-(49/4) = 0
(21/5)*b-49/4 = 0
21/5*b-49/4 = 0 // + 49/4
21/5*b = 49/4 // : 21/5
b = 49/4/21/5
b = 35/12
b = 35/12
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