Help Me! A problem with linearizing

hello
Please Help Me:
i can't linearize this equation:

where G is government expenditure, r is interest rate, b is bond , π is p/p(-1), T is tax, EX is nominal exchange rate, Oil is oil revenue and DC is government debt to central bank.
Please Help Me:
i can't linearize this equation:

where G is government expenditure, r is interest rate, b is bond , π is p/p(-1), T is tax, EX is nominal exchange rate, Oil is oil revenue and DC is government debt to central bank.