2(-9+r)=-20

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Solution for 2(-9+r)=-20 equation: 



2(-9+r)=-20

We move all terms to the left:

2(-9+r)-(-20)=0

We add all the numbers together, and all the variables

2(r-9)-(-20)=0

We add all the numbers together, and all the variables

2(r-9)+20=0

We multiply parentheses

2r-18+20=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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