x+x+280=1000

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Solution for x+x+280=1000 equation: 



x+x+280=1000

We move all terms to the left:

x+x+280-(1000)=0

We add all the numbers together, and all the variables

2x-720=0

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

2x=720

x=720/2

x=360

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