-20.9=x+15

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Solution for -20.9=x+15 equation: 



-20.9=x+15

We move all terms to the left:

-20.9-(x+15)=0

We get rid of parentheses

-x-15-20.9=0

We add all the numbers together, and all the variables

-1x-35.9=0

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

-x=35.9

x=35.9/-1

x=-35+0.9/1

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