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b in (-oo:+oo)
(3*b)/5 = 4*b-51 // - 4*b-51
(3*b)/5-(4*b)+51 = 0
(3*b)/5-4*b+51 = 0
51-17/5*b = 0 // - 51
-17/5*b = -51 // : -17/5
b = -51/(-17/5)
b = 15
b = 15
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