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2x+(x-10)=500
We move all terms to the left:
2x+(x-10)-(500)=0
We get rid of parentheses
2x+x-10-500=0
We add all the numbers together, and all the variables
3x-510=0
We move all terms containing x to the left, all other terms to the right
3x=510
x=510/3
x=170
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