r+2+r=4

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Solution for r+2+r=4 equation: 



r+2+r=4

We move all terms to the left:

r+2+r-(4)=0

We add all the numbers together, and all the variables

2r-2=0

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

2r=2

r=2/2

r=1

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