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x in (-oo:+oo)
M/m-8-7 = 7/m-7 // - 7/m-7
M/m-(7/m)-8-7+7 = 0
M/m-7*m^-1-8-7+7 = 0
M*m^-1-7*m^-1-8 = 0
x naleu017Cy do R
x in (-oo:+oo)
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