How does the using nominal instead of real values comes from? is I pi, g nominal values or the real values? Please explain it step by step, thanks !

Omitting time scripts gives: ADG_T+ D How does this formula change if we use nominal instead of real values? Interpret the result. Since r = 1' 11', we have D GT _ D V=T+0_"_9)7 D GT _D D A?=T+z?(n+g)? 0n the left is the change in the debt ratio this is equal to the sum of three terms (all ofwhich are expressed as a fraction of GDP). The first two terms are those which tend to raise the debt ratio: the primary decit and nominal interest payments on the debt. The third term tends to reduce the debt ratio (at least for growing economies) and is equal to the nominal growth rate of the economy times the debt ratio