4r(-2r)=-8r2

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Solution for 4r(-2r)=-8r2 equation: 



4r(-2r)=-8r^2

We move all terms to the left:

4r(-2r)-(-8r^2)=0

We multiply parentheses

-(-8r^2)-8r^2=0

We get rid of parentheses

8r^2-8r^2=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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