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b in (-oo:+oo)
b+5 = 7*b-43 // - 7*b-43
b-(7*b)+5+43 = 0
b-7*b+5+43 = 0
48-6*b = 0 // - 48
-6*b = -48 // : -6
b = -48/(-6)
b = 8
b = 8
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