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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
-1/5*b-12/5 = 0 // + 12/5
-1/5*b = 12/5 // : -1/5
b = 12/5/(-1/5)
b = -12
b = -12
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