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x in (-oo:+oo)
M/2 = 10*r-(m/2) // - 10*r-(m/2)
M/2+m/2-(10*r) = 0
M/2+m/2-10*r = 0
1/2*M+1/2*m-10*r = 0
x należy do R
x in (-oo:+oo)
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