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b in (-oo:+oo)
4-(4*b) = 3*b+25 // - 3*b+25
4-(4*b)-(3*b)-25 = 0
4-4*b-3*b-25 = 0
-7*b-21 = 0 // + 21
-7*b = 21 // : -7
b = 21/(-7)
b = -3
b = -3
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