40=-16-8r

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Solution for 40=-16-8r equation: 



40=-16-8r

We move all terms to the left:

40-(-16-8r)=0

We add all the numbers together, and all the variables

-(-8r-16)+40=0

We get rid of parentheses

8r+16+40=0

We add all the numbers together, and all the variables

8r+56=0

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

8r=-56

r=-56/8

r=-7

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