Answer:

Step-by-step explanation:

You got to shade five squares
Answer:
x=12
Step-by-step explanation:
move the 3 to the other side to get x by itself.
check: 12 + 3 = 15
Answer:
"like terms"
Step-by-step explanation:
It looks like you're asking for the word or phrase that has the meaning you have given. Such terms are called <em>like terms</em>.