28=15+x

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Solution for 28=15+x equation: 



28=15+x

We move all terms to the left:

28-(15+x)=0

We add all the numbers together, and all the variables

-(x+15)+28=0

We get rid of parentheses

-x-15+28=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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