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(9/2)*M-8 = 4*m+5.5 // - 4*m+5.5
(9/2)*M-(4*m)-8-5.5 = 0
(9/2)*M-4*m-8-5.5 = 0
9/2*M-4*m-13.5 = 0
x naleu017Cy do R
x in (-oo:+oo)
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