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D( q )
6*q-10 = 0
6*q-10 = 0
6*q-10 = 0
6*q-10 = 0 // + 10
6*q = 10 // : 6
q = 10/6
q = 5/3
q in (-oo:5/3) U (5/3:+oo)
(-2*q)/(6*q-10)+3 = 10/(6*q-10) // - 10/(6*q-10)
(-2*q)/(6*q-10)-(10/(6*q-10))+3 = 0
(-2*q)/(6*q-10)-10*(6*q-10)^-1+3 = 0
(-2*q)/(6*q-10)-10/(6*q-10)+3 = 0
(-2*q)/(6*q-10)-10/(6*q-10)+(3*(6*q-10))/(6*q-10) = 0
3*(6*q-10)-2*q-10 = 0
18*q-2*q-30-10 = 0
16*q-40 = 0
(16*q-40)/(6*q-10) = 0
(16*q-40)/(6*q-10) = 0 // * 6*q-10
16*q-40 = 0
16*q-40 = 0 // + 40
16*q = 40 // : 16
q = 40/16
q = 5/2
q = 5/2
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