-10=40+10r

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Solution for -10=40+10r equation: 



-10=40+10r

We move all terms to the left:

-10-(40+10r)=0

We add all the numbers together, and all the variables

-(10r+40)-10=0

We get rid of parentheses

-10r-40-10=0

We add all the numbers together, and all the variables

-10r-50=0

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

-10r=50

r=50/-10

r=-5

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