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