4s+21=61

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Solution for 4s+21=61 equation: 



4s+21=61

We move all terms to the left:

4s+21-(61)=0

We add all the numbers together, and all the variables

4s-40=0

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

4s=40

s=40/4

s=10

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