2*r+5+2*r-5=40

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Solution for 2*r+5+2*r-5=40 equation: 



2r+5+2r-5=40

We move all terms to the left:

2r+5+2r-5-(40)=0

We add all the numbers together, and all the variables

4r-40=0

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

4r=40

r=40/4

r=10

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