-42=4.2r

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Solution for -42=4.2r equation: 



-42=4.2r

We move all terms to the left:

-42-(4.2r)=0

We add all the numbers together, and all the variables

-(+4.2r)-42=0

We get rid of parentheses

-4.2r-42=0

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

-4.2r=42

r=42/-4.2

r=-10

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