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b in (-oo:+oo)
3*b+6 = 7*b+50 // - 7*b+50
3*b-(7*b)-50+6 = 0
3*b-7*b-50+6 = 0
-4*b-44 = 0 // + 44
-4*b = 44 // : -4
b = 44/(-4)
b = -11
b = -11
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