21s+4=27s-20

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Solution for 21s+4=27s-20 equation: 



21s+4=27s-20

We move all terms to the left:

21s+4-(27s-20)=0

We get rid of parentheses

21s-27s+20+4=0

We add all the numbers together, and all the variables

-6s+24=0

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

-6s=-24

s=-24/-6

s=+4

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