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b in (-oo:+oo)
2*(-5*b-1) = -22 // + 22
2*(-5*b-1)+22 = 0
2*(-5*b-1)+22 = 0
20-10*b = 0
20-10*b = 0
20-10*b = 0 // - 20
-10*b = -20 // : -10
b = -20/(-10)
b = 2
b = 2
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