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b in (-oo:+oo)
5*(8-b) = 30 // - 30
5*(8-b)-30 = 0
5*(8-b)-30 = 0
10-5*b = 0
10-5*b = 0
10-5*b = 0 // - 10
-5*b = -10 // : -5
b = -10/(-5)
b = 2
b = 2
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