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x in (-oo:+oo)
1/a+1/t = 1/u // - 1/u
1/a+1/t-(1/u) = 0
1/a+1/t-u^-1 = 0
a^-1+t^-1-u^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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