220=40+30s

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Solution for 220=40+30s equation: 



220=40+30s

We move all terms to the left:

220-(40+30s)=0

We add all the numbers together, and all the variables

-(30s+40)+220=0

We get rid of parentheses

-30s-40+220=0

We add all the numbers together, and all the variables

-30s+180=0

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

-30s=-180

s=-180/-30

s=+6

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