215=280-x

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Solution for 215=280-x equation: 



215=280-x

We move all terms to the left:

215-(280-x)=0

We add all the numbers together, and all the variables

-(-1x+280)+215=0

We get rid of parentheses

1x-280+215=0

We add all the numbers together, and all the variables

x-65=0

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

x=65

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