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200=7.5x+500
We move all terms to the left:
200-(7.5x+500)=0
We get rid of parentheses
-7.5x-500+200=0
We add all the numbers together, and all the variables
-7.5x-300=0
We move all terms containing x to the left, all other terms to the right
-7.5x=300
x=300/-7.5
x=-40
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