3.5+8=12.5-x

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Solution for 3.5+8=12.5-x equation: 



3.5+8=12.5-x

We move all terms to the left:

3.5+8-(12.5-x)=0

We add all the numbers together, and all the variables

-(-1x+12.5)+3.5+8=0

We add all the numbers together, and all the variables

-(-1x+12.5)+11.5=0

We get rid of parentheses

1x-12.5+11.5=0

We add all the numbers together, and all the variables

x-1=0

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

x=1

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