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3x+(2x-40)=500
We move all terms to the left:
3x+(2x-40)-(500)=0
We get rid of parentheses
3x+2x-40-500=0
We add all the numbers together, and all the variables
5x-540=0
We move all terms containing x to the left, all other terms to the right
5x=540
x=540/5
x=108
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