-30=12-6r

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Solution for -30=12-6r equation: 



-30=12-6r

We move all terms to the left:

-30-(12-6r)=0

We add all the numbers together, and all the variables

-(-6r+12)-30=0

We get rid of parentheses

6r-12-30=0

We add all the numbers together, and all the variables

6r-42=0

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

6r=42

r=42/6

r=7

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