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500=3x-100
We move all terms to the left:
500-(3x-100)=0
We get rid of parentheses
-3x+100+500=0
We add all the numbers together, and all the variables
-3x+600=0
We move all terms containing x to the left, all other terms to the right
-3x=-600
x=-600/-3
x=+200
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