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b in (-oo:+oo)
5-7*b-(3*b) = 25 // - 25
5-7*b-(3*b)-25 = 0
5-7*b-3*b-25 = 0
-10*b-20 = 0 // + 20
-10*b = 20 // : -10
b = 20/(-10)
b = -2
b = -2
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