21+4s=53

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Solution for 21+4s=53 equation: 



21+4s=53

We move all terms to the left:

21+4s-(53)=0

We add all the numbers together, and all the variables

4s-32=0

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

4s=32

s=32/4

s=8

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