21s+6=90

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Solution for 21s+6=90 equation: 



21s+6=90

We move all terms to the left:

21s+6-(90)=0

We add all the numbers together, and all the variables

21s-84=0

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

21s=84

s=84/21

s=4

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