Answer:
C
Explanation:
9x+4.5-2x=2.3+7x+2.2
9x-2x+4.5=2.3+7x+2.2
7x+4.5-4.5=7x+4.5-4.5
7x=7x
7x-7x=7x-7x
0=0
7.5m questions
10.1m answers