3.9=5.5-0.2s

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Solution for 3.9=5.5-0.2s equation: 



3.9=5.5-0.2s

We move all terms to the left:

3.9-(5.5-0.2s)=0

We add all the numbers together, and all the variables

-(-0.2s+5.5)+3.9=0

We get rid of parentheses

0.2s-5.5+3.9=0

We add all the numbers together, and all the variables

0.2s-1.6=0

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

0.2s=1.6

s=1.6/0.2

s=8

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