13=28+7x

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Solution for 13=28+7x equation: 



13=28+7x

We move all terms to the left:

13-(28+7x)=0

We add all the numbers together, and all the variables

-(7x+28)+13=0

We get rid of parentheses

-7x-28+13=0

We add all the numbers together, and all the variables

-7x-15=0

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

-7x=15

x=15/-7

x=-2+1/7

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