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b in (-oo:+oo)
3*b+4 = 7*b+32 // - 7*b+32
3*b-(7*b)-32+4 = 0
3*b-7*b-32+4 = 0
-4*b-28 = 0 // + 28
-4*b = 28 // : -4
b = 28/(-4)
b = -7
b = -7
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