4s+12=7s-21

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Solution for 4s+12=7s-21 equation: 



4s+12=7s-21

We move all terms to the left:

4s+12-(7s-21)=0

We get rid of parentheses

4s-7s+21+12=0

We add all the numbers together, and all the variables

-3s+33=0

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

-3s=-33

s=-33/-3

s=+11

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