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x in (-oo:+oo)
2*a-(a*((4*b)/3))+b = 1/5 // - 1/5
2*a-(a*((4*b)/3))+b-(1/5) = 0
2*a+(-4/3)*a*b+b-1/5 = 0
2*a+b-4/3*a*b-1/5 = 0
x naleu017Cy do R
x in (-oo:+oo)
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