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b in (-oo:+oo)
(-1/3)*b-(4/15) = (-1/5)*b+1/3 // - (-1/5)*b+1/3
(-1/3)*b-((-1/5)*b)-(4/15)-(1/3) = 0
(-1/3)*b+(1/5)*b-4/15-1/3 = 0
-2/15*b-3/5 = 0 // + 3/5
-2/15*b = 3/5 // : -2/15
b = 3/5/(-2/15)
b = -9/2
b = -9/2
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