How do you solve 5r - 9= 3+ 3r?

1 Answer
Sep 4, 2017

r = 6", see explanation for how to solve."

Explanation:

5r - 9 = 3 + 3r

5r= 9 + 3 + 3r

5r - 3r= 9 + 3

2r= 12

r= 12/2

color(blue)(r= 6

"We can now substitute " 3 " for " r " to prove our answer."

5 xx 6 - 9 = 3 + 3 xx 6

30 - 9 = 3 + 18

30 - 9 = 21

21 = 21