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D( q )
q-5 = 0
q-5 = 0
q-5 = 0
q-5 = 0 // + 5
q = 5
q in (-oo:5) U (5:+oo)
(2*q*((q+5)/(-5)))/(q-5) = 0
(2*q*(q+5))/(-5*(q-5)) = 0
( 2*q )
2*q = 0 // : 2
q = 0
( q+5 )
q+5 = 0 // - 5
q = -5
q in { 0, -5 }
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