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b in (-oo:+oo)
(5/8)*b = 4*b-189 // - 4*b-189
(5/8)*b-(4*b)+189 = 0
(5/8)*b-4*b+189 = 0
189-27/8*b = 0 // - 189
-27/8*b = -189 // : -27/8
b = -189/(-27/8)
b = 56
b = 56
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