r*2=18-7r

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Solution for r*2=18-7r equation: 



r*2=18-7r

We move all terms to the left:

r*2-(18-7r)=0

We add all the numbers together, and all the variables

r*2-(-7r+18)=0

Wy multiply elements

2r-(-7r+18)=0

We get rid of parentheses

2r+7r-18=0

We add all the numbers together, and all the variables

9r-18=0

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

9r=18

r=18/9

r=2

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