7s+9=4s-9

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Solution for 7s+9=4s-9 equation: 



7s+9=4s-9

We move all terms to the left:

7s+9-(4s-9)=0

We get rid of parentheses

7s-4s+9+9=0

We add all the numbers together, and all the variables

3s+18=0

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

3s=-18

s=-18/3

s=-6

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