-40-30=-2r-8r

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Solution for -40-30=-2r-8r equation: 



-40-30=-2r-8r

We move all terms to the left:

-40-30-(-2r-8r)=0

We add all the numbers together, and all the variables

-(-10r)-40-30=0

We add all the numbers together, and all the variables

-(-10r)-70=0

We get rid of parentheses

10r-70=0

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

10r=70

r=70/10

r=7

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