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b in (-oo:+oo)
5*b+4 = 7*b+2 // - 7*b+2
5*b-(7*b)-2+4 = 0
5*b-7*b-2+4 = 0
2-2*b = 0 // - 2
-2*b = -2 // : -2
b = -2/(-2)
b = 1
b = 1
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