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x in (-oo:+oo)
M-(9/7) = m-(2/4) // - m-(2/4)
M-m-(9/7)+2/4 = 0
M-m-9/7+2/4 = 0
M-m-11/14 = 0
x naleu017Cy do R
x in (-oo:+oo)
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