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D( Q )
Q = 0
Q = 0
Q = 0
Q in (-oo:0) U (0:+oo)
1-10/Q = -1 // + 1
1-10/Q+1 = 0
-10*Q^-1 = -2 // : -10
Q^-1 = 1/5
-1 < 0
1/(Q^1) = 1/5 // * Q^1
1 = 1/5*Q^1 // : 1/5
5 = Q^1
Q = 5
Q = 5
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