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b in (-oo:+oo)
(-1/2)*b+(2/5)*b-(2/9) = -2/9 // + -2/9
(-1/2)*b+(2/5)*b-(2/9)-(-2/9) = 0
(-1/2)*b+(2/5)*b-2/9+2/9 = 0
-1/10*b = 0 // : -1/10
b = 0
b = 0
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