6r+7=13+7r
Simplify both sides of the equation
6r+7=7r+13
Subtract 7r from both sides
6r+7-7r=7r+13-7r
-r+7=13
Subtract 7 from both sides
-r+7-7=13-7
-r=6
Divide both sides by -1
-r/-1=6/-1
r=-6
Answer : r=-6
I hope that's help !
