The equation you are looking for is simply A=L+OE.
Assets (A) are things of value. The business needs to get the money to pay for these things either from money within the business (Owner's Equity) or they borrow money from outside the business (L = Liabilities).
(30,000 + 15,000 + 20,000 + 30,000) - (60,000 + 10,000)
(assets = L + O.E (Owners Equity is also known as Shareholders Funds or Propieter Funds[ not too sure about the last one ] ) )