write a two-column proof to prove the following

Question

If 2g+9=13, then g=2

Answer 1

How would you SOLVE this?  By the usual steps to isolate g.

Do the steps one at a time; to the right of each step, write the justification.  Done!!

Examples of justifications: using additive inverse of a constant to eliminate that term from left side; dividing both sides by a coefficient to yield (1)g = ...