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x in (-oo:+oo)
A = (1/2)*d^1*d^2 // - (1/2)*d^1*d^2
A-((1/2)*d^1*d^2) = 0
A+(-1/2)*d^3 = 0
A-1/2*d^3 = 0
x naleu017Cy do R
x in (-oo:+oo)
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