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b in (-oo:+oo)
(1/3)*b+15 = 2*b-25 // - 2*b-25
(1/3)*b-(2*b)+15+25 = 0
(1/3)*b-2*b+15+25 = 0
40-5/3*b = 0 // - 40
-5/3*b = -40 // : -5/3
b = -40/(-5/3)
b = 24
b = 24
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