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x in (-oo:+oo)
M/3-((2*m)/5) = 1/5 // - 1/5
M/3-((2*m)/5)-(1/5) = 0
M/3+(-2/5)*m-1/5 = 0
1/3*M-2/5*m-1/5 = 0
x należy do R
x in (-oo:+oo)
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