7+3s=-s-9

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Solution for 7+3s=-s-9 equation: 



7+3s=-s-9

We move all terms to the left:

7+3s-(-s-9)=0

We add all the numbers together, and all the variables

3s-(-1s-9)+7=0

We get rid of parentheses

3s+1s+9+7=0

We add all the numbers together, and all the variables

4s+16=0

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

4s=-16

s=-16/4

s=-4

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