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b in (-oo:+oo)
(3/4)*b^3-(0.2*b^3)-(1.5*b^3)+(1/5)*b^3 = 0
(3/4)*b^3-0.2*b^3-1.5*b^3+(1/5)*b^3 = 0
-0.75*b^3 = 0 // : -0.75
b^3 = 0
b = 0
b = 0
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