31+2k=91

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Solution for 31+2k=91 equation: 



31+2k=91

We move all terms to the left:

31+2k-(91)=0

We add all the numbers together, and all the variables

2k-60=0

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

2k=60

k=60/2

k=30

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