28=13+x

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Solution for 28=13+x equation: 



28=13+x

We move all terms to the left:

28-(13+x)=0

We add all the numbers together, and all the variables

-(x+13)+28=0

We get rid of parentheses

-x-13+28=0

We add all the numbers together, and all the variables

-1x+15=0

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

-x=-15

x=-15/-1

x=+15

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