-42=-3(10+r)

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Solution for -42=-3(10+r) equation: 



-42=-3(10+r)

We move all terms to the left:

-42-(-3(10+r))=0

We add all the numbers together, and all the variables

-(-3(r+10))-42=0



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

-3(r+10)

We multiply parentheses

-3r-30

Back to the equation:

-(-3r-30)



We get rid of parentheses

3r+30-42=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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