280=20(x)+500

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Solution for 280=20(x)+500 equation: 



280=20(x)+500

We move all terms to the left:

280-(20(x)+500)=0

We get rid of parentheses

-20x-500+280=0

We add all the numbers together, and all the variables

-20x-220=0

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

-20x=220

x=220/-20

x=-11

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