20.5=x+4,

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Solution for 20.5=x+4, equation: 



20.5=x+4.

We move all terms to the left:

20.5-(x+4.)=0

We add all the numbers together, and all the variables

-(x+4)+20.5=0

We get rid of parentheses

-x-4+20.5=0

We add all the numbers together, and all the variables

-1x+16.5=0

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

-x=-16.5

x=-16.5/-1

x=16+0.5/1

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