-138=-5-7r

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Solution for -138=-5-7r equation: 



-138=-5-7r

We move all terms to the left:

-138-(-5-7r)=0

We add all the numbers together, and all the variables

-(-7r-5)-138=0

We get rid of parentheses

7r+5-138=0

We add all the numbers together, and all the variables

7r-133=0

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

7r=133

r=133/7

r=19

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