21+3s=75

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Solution for 21+3s=75 equation: 



21+3s=75

We move all terms to the left:

21+3s-(75)=0

We add all the numbers together, and all the variables

3s-54=0

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

3s=54

s=54/3

s=18

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