Well first you have to add common like terms in this case 2r and -6r to get -4r now your equation is -4r+8=40, now subtract 8 from both sides to leave r by itself and get -4r=32, now divide both sides by -4 to get r=-8
Hope this helps
Associative property of addition
5.5 is your answer your welcome
Let x = 0.25555…
10x=2.555…
9x=2.3
90x=23
x=23/90
