Since ur using r as a variable the answer is r = 7.
-54-7r=10+25r
-7r-25r=10+54
-32r=64
r=64/-32
r=-2
Teresa gave away 8 baseball cards and has 4 left. 8 plus 4 means she originally had 12. Right now she has 4 out of her original 12 cards remaining. This gives us 4/12. We can simplify this by dividing our greatest common factors. 4 goes into both parts of our fraction, when we divide each part by 4 we end up with 1/3. Since we are unable to simplify this problem any further, this means our solution and fraction is 4/12 aka 1/3.
5
5 x 8 = 40
6 x 1 = 6
40 / 6 = 6
= 6 2/3
(hope I'm right & this helps you!)
