Question

2 1/2r + 1 + 2r = 9 1/10

Answer 1

This should help you here are the steps of your problem :)

2*(1/2)*r+2*r+1 = 9*(1/10) // - 9*(1/10)

2*(1/2)*r+2*r-(9*(1/10))+1 = 0

2*(1/2)*r+2*r-9/10+1 = 0

3*r+1/10 = 0 // - 1/10

3*r = -1/10 // : 3

r = -1/10/3

r = -1/30

r = -1/30

So your answer would be 1/30