2r-4+7r=-20

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Solution for 2r-4+7r=-20 equation: 



2r-4+7r=-20

We move all terms to the left:

2r-4+7r-(-20)=0

We add all the numbers together, and all the variables

9r+16=0

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

9r=-16

r=-16/9

r=-1+7/9

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