9s-19=4s+21

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Solution for 9s-19=4s+21 equation: 



9s-19=4s+21

We move all terms to the left:

9s-19-(4s+21)=0

We get rid of parentheses

9s-4s-21-19=0

We add all the numbers together, and all the variables

5s-40=0

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

5s=40

s=40/5

s=8

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