7(r-3)=8r-13

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Solution for 7(r-3)=8r-13 equation: 



7(r-3)=8r-13

We move all terms to the left:

7(r-3)-(8r-13)=0

We multiply parentheses

7r-(8r-13)-21=0

We get rid of parentheses

7r-8r+13-21=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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