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