25=12+x

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Solution for 25=12+x equation: 



25=12+x

We move all terms to the left:

25-(12+x)=0

We add all the numbers together, and all the variables

-(x+12)+25=0

We get rid of parentheses

-x-12+25=0

We add all the numbers together, and all the variables

-1x+13=0

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

-x=-13

x=-13/-1

x=+13

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