4r+12/8=5r-20/5=

Answer 1

4r+12/8=5r-20/5=

4r + 1.5 = 5r - 4

5.5 = r

Answer 2

or, assuming the usual carelessness with parentheses,

(4r+12)/8 = (5r-20)/5
r/2 + 3/2 = r - 4
r = 11