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b in (-oo:+oo)
(-1/5)*b = -1/15 // + -1/15
(-1/5)*b-(-1/15) = 0
(-1/5)*b+1/15 = 0
1/15-1/5*b = 0 // - 1/15
-1/5*b = -1/15 // : -1/5
b = -1/15/(-1/5)
b = 1/3
b = 1/3
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