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x in (-oo:+oo)
M+(8/9)*m = 5/9 // - 5/9
M+(8/9)*m-(5/9) = 0
M+(8/9)*m-5/9 = 0
M+8/9*m-5/9 = 0
x naleu017Cy do R
x in (-oo:+oo)
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