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-10+6r-8=-r+10

We move all terms to the left:

-10+6r-8-(-r+10)=0

We add all the numbers together, and all the variables

6r-(-1r+10)-10-8=0

We add all the numbers together, and all the variables

6r-(-1r+10)-18=0

We get rid of parentheses

6r+1r-10-18=0

We add all the numbers together, and all the variables

7r-28=0

We move all terms containing r to the left, all other terms to the right

7r=28

r=28/7

r=4

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