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280=2x-8
We move all terms to the left:
280-(2x-8)=0
We get rid of parentheses
-2x+8+280=0
We add all the numbers together, and all the variables
-2x+288=0
We move all terms containing x to the left, all other terms to the right
-2x=-288
x=-288/-2
x=+144
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