Respuesta :

5(5r-9)=155 can be written as 25r-45=155. You move -45 to the other side of the equation resulting in 25r=155+45. Finally 25r=200 so r=8.
25r - 45 = 155 Subtract 45 25r = 155 Divide by 25 to get x alone r = 6.2