2r-40=280

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Solution for 2r-40=280 equation: 



2r-40=280

We move all terms to the left:

2r-40-(280)=0

We add all the numbers together, and all the variables

2r-320=0

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

2r=320

r=320/2

r=160

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