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100=50x+500
We move all terms to the left:
100-(50x+500)=0
We get rid of parentheses
-50x-500+100=0
We add all the numbers together, and all the variables
-50x-400=0
We move all terms containing x to the left, all other terms to the right
-50x=400
x=400/-50
x=-8
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