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x in (-oo:+oo)
A+2/3 = (13/5)*a-4/21 // - (13/5)*a-4/21
A-((13/5)*a)+2/3-(-4/21) = 0
A+(-13/5)*a+2/3+4/21 = 0
A-13/5*a+6/7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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