Answer:
B
Step-by-step explanation:
common means you want the same denominator so you want the denominator to be both 10. 2 x 2 = 4, 2 x 5 = 10 so 4/10
9x = -3 put together all your like terms
-3/9 = x or -1/3 isolate x
I think it’s A cus it’s more general info about it that sums up the difference of the chronicle to the other ones i’m not sure tho