2-8r=40

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Solution for 2-8r=40 equation: 



2-8r=40

We move all terms to the left:

2-8r-(40)=0

We add all the numbers together, and all the variables

-8r-38=0

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

-8r=38

r=38/-8

r=-4+3/4

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