18-r=-42

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Solution for 18-r=-42 equation: 



18-r=-42

We move all terms to the left:

18-r-(-42)=0

We add all the numbers together, and all the variables

-1r+60=0

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

-r=-60

r=-60/-1

r=+60

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