4.2=-r+-8.7

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Solution for 4.2=-r+-8.7 equation: 



4.2=-r+-8.7

We move all terms to the left:

4.2-(-r+-8.7)=0

We add all the numbers together, and all the variables

-(-1r-8.7)+4.2=0

We get rid of parentheses

1r+8.7+4.2=0

We add all the numbers together, and all the variables

r+12.9=0

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

r=-12.9

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