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b in (-oo:+oo)
(-1/5)*b-(2/5) = -2 // + 2
(-1/5)*b-(2/5)+2 = 0
(-1/5)*b-2/5+2 = 0
8/5-1/5*b = 0 // - 8/5
-1/5*b = -8/5 // : -1/5
b = -8/5/(-1/5)
b = 8
b = 8
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