1+3+7r=11

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Solution for 1+3+7r=11 equation: 



1+3+7r=11

We move all terms to the left:

1+3+7r-(11)=0

We add all the numbers together, and all the variables

7r-7=0

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

7r=7

r=7/7

r=1

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