28=40-x

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Solution for 28=40-x equation: 



28=40-x

We move all terms to the left:

28-(40-x)=0

We add all the numbers together, and all the variables

-(-1x+40)+28=0

We get rid of parentheses

1x-40+28=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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