21+7s=91

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Solution for 21+7s=91 equation: 



21+7s=91

We move all terms to the left:

21+7s-(91)=0

We add all the numbers together, and all the variables

7s-70=0

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

7s=70

s=70/7

s=10

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