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b in (-oo:+oo)
(-4/5)*b = -1/5 // + -1/5
(-4/5)*b-(-1/5) = 0
(-4/5)*b+1/5 = 0
1/5-4/5*b = 0 // - 1/5
-4/5*b = -1/5 // : -4/5
b = -1/5/(-4/5)
b = 1/4
b = 1/4
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