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x in (-oo:+oo)
1/c+2/c+y-7 = 1/y // - 1/y
1/c+2/c+y-(1/y)-7 = 0
1/c+2/c+y-y^-1-7 = 0
3*c^-1+y-y^-1-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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