-7s=-20-9s

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Solution for -7s=-20-9s equation: 



-7s=-20-9s

We move all terms to the left:

-7s-(-20-9s)=0

We add all the numbers together, and all the variables

-7s-(-9s-20)=0

We get rid of parentheses

-7s+9s+20=0

We add all the numbers together, and all the variables

2s+20=0

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

2s=-20

s=-20/2

s=-10

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