9= 12\frac{1}{2}21 a 323^{2}32
6,000,000
28,000,000
18,000,000
3,750,000 ∑abC\sum_{a}^{b}{C}a∑bC
x-2=2x+1
x-2=2x+1-2
b/3 < 12
X^4*X
s1s qxv3lvyvpv
7 + 7
what does sum mean