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b in (-oo:+oo)
-b-10 = 3*b+30 // - 3*b+30
-b-(3*b)-30-10 = 0
-b-3*b-30-10 = 0
-4*b-40 = 0 // + 40
-4*b = 40 // : -4
b = 40/(-4)
b = -10
b = -10
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