Answer:
C. Get it by itself
Step-by-step explanation:
When solving for a variable, whether it be an inequality, a factor, or an algebraic expression. Getting the specified variable by itself is the most effective and best way to get that answer to your question. The other two answers here do not make any sense whatsoever.
we are given to simplify

Open the bracket and write the like terms together

when the bases are same then the exponents gets added

If I remember My geometry correctly
you add GH AND EF then divide 2
6 I think because 6•3=18, 6•7=42, and 6•2=12