Question

100 - r = 99.52 What's r

Answer 1

100-r=99.52
First, add r to both sides.
100-r+r=99.52+r
And then simplify.
100=99.52+r
Then, subtract 99.52 from both sides.
100-99.52=99.52+r-99.52
And simplify.
0.48=r
So,
r=0.48

Answer 2

100 - r = 99.52
-100      -100
      -r = -.48
      /-1   /-1
       r = .48