25=12+x+9

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Solution for 25=12+x+9 equation: 



25=12+x+9

We move all terms to the left:

25-(12+x+9)=0

We add all the numbers together, and all the variables

-(x+21)+25=0

We get rid of parentheses

-x-21+25=0

We add all the numbers together, and all the variables

-1x+4=0

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

-x=-4

x=-4/-1

x=+4

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