2(r+8)=18

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Solution for 2(r+8)=18 equation: 



2(r+8)=18

We move all terms to the left:

2(r+8)-(18)=0

We multiply parentheses

2r+16-18=0

We add all the numbers together, and all the variables

2r-2=0

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

2r=2

r=2/2

r=1

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