Question

Solve this equation, 6r+7=13+7r

Answer 1

6r+7=13+7r
so first you get the variable on one side
then you would get 
r+7=13
subtract 7
r= 6

Answer 2

Subtract 6r on both sides and you get... 7=13+7r
Then subtract 13 on both sides and get.... -6=1r 
Divide by 1 and you get r=-6 because when you divide a negative and positive you get a negative answer. 
Hope it helped :)