(a) A debtor is insolvent if the sum of the debtor's debts is greater than all of the debtor's assets at a fair valuation.
(b) A debtor who is generally not paying his (or her) debts as they become due is presumed to be insolvent.
(c) A partnership is insolvent under subsection (a) if the sum of the partnership's debts is greater than the aggregate, at a fair valuation, of all the partnership's assets and the sum of the excess of the value of each general partner's nonpartnership assets over the partner's nonpartnership debts.
(d) Assets under this section do not include property that has been transferred, concealed or removed with intent to hinder, delay or defraud creditors or that has been transferred in a manner making the transfer voidable under this article.
(e) Debts under this section do not include an obligation to the extent it is secured by a valid lien on property of the debtor not included as an asset.