20-15s=-20-7s-4s

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Solution for 20-15s=-20-7s-4s equation: 



20-15s=-20-7s-4s

We move all terms to the left:

20-15s-(-20-7s-4s)=0

We add all the numbers together, and all the variables

-15s-(-11s-20)+20=0

We get rid of parentheses

-15s+11s+20+20=0

We add all the numbers together, and all the variables

-4s+40=0

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

-4s=-40

s=-40/-4

s=+10

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