human
Subtract two equations together to remove a variable  Isaac is trying to solve the pair of simultaneous equations on the right.

\[
6 g+h=12
\]
\[
6 g-3 h=-3
\]

He decides to subtract the bottom equation from the top equation.
What will he end up with? \( -2 h=15 \)
gpt
When subtracting a negative number, subtracts the absolute value rather than adding it