Respuesta :

I think r= 5
7r-7=2r+18
Subtract 2 from 7r and 2r
U get 5r-7=18
Then add 7 to 7 and 18
18+7= 25
the remainder is 5r and 25
So u divide 5 to 5r and 25 then ur answer is 5
So r=5