Answer:
I think your answer is(C) rotation.
The first sentence starting with, "First of all..." is the topic sentence. The second is not because it is adding detail to the sentence given.
Hope this helps!
6(a+3) = 18 + 6a
6(a+3)=6(3+a)
a+3=3+a
a-a=3-3
0a=0
<span>B. all real numbers</span>
