-7=3(r-10)-7

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Solution for -7=3(r-10)-7 equation: 



-7=3(r-10)-7

We move all terms to the left:

-7-(3(r-10)-7)=0



We calculate terms in parentheses: -(3(r-10)-7), so:

3(r-10)-7

We multiply parentheses

3r-30-7

We add all the numbers together, and all the variables

3r-37

Back to the equation:

-(3r-37)



We get rid of parentheses

-3r+37-7=0

We add all the numbers together, and all the variables

-3r+30=0

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

-3r=-30

r=-30/-3

r=+10

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