-70=20-10r

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Solution for -70=20-10r equation: 



-70=20-10r

We move all terms to the left:

-70-(20-10r)=0

We add all the numbers together, and all the variables

-(-10r+20)-70=0

We get rid of parentheses

10r-20-70=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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