13=x+8+4

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Solution for 13=x+8+4 equation: 



13=x+8+4

We move all terms to the left:

13-(x+8+4)=0

We add all the numbers together, and all the variables

-(x+12)+13=0

We get rid of parentheses

-x-12+13=0

We add all the numbers together, and all the variables

-1x+1=0

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

-x=-1

x=-1/-1

x=1

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