3r-13=7(r-3)

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



3r-13=7(r-3)

We move all terms to the left:

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



We calculate terms in parentheses: -(7(r-3)), so:

7(r-3)

We multiply parentheses

7r-21

Back to the equation:

-(7r-21)



We get rid of parentheses

3r-7r+21-13=0

We add all the numbers together, and all the variables

-4r+8=0

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

-4r=-8

r=-8/-4

r=+2

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