91+2r=7

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Solution for 91+2r=7 equation: 



91+2r=7

We move all terms to the left:

91+2r-(7)=0

We add all the numbers together, and all the variables

2r+84=0

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

2r=-84

r=-84/2

r=-42

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