8r-2r+8r+3r-7r=40

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Solution for 8r-2r+8r+3r-7r=40 equation: 



8r-2r+8r+3r-7r=40

We move all terms to the left:

8r-2r+8r+3r-7r-(40)=0

We add all the numbers together, and all the variables

10r-40=0

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

10r=40

r=40/10

r=4

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