2(9-r)=18-2r

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Solution for 2(9-r)=18-2r equation: 



2(9-r)=18-2r

We move all terms to the left:

2(9-r)-(18-2r)=0

We add all the numbers together, and all the variables

2(-1r+9)-(-2r+18)=0

We multiply parentheses

-2r-(-2r+18)+18=0

We get rid of parentheses

-2r+2r-18+18=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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