-2(-2r-1)=10

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Solution for -2(-2r-1)=10 equation: 



-2(-2r-1)=10

We move all terms to the left:

-2(-2r-1)-(10)=0

We multiply parentheses

4r+2-10=0

We add all the numbers together, and all the variables

4r-8=0

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

4r=8

r=8/4

r=2

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