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250x+1000=-100+400x-400
We move all terms to the left:
250x+1000-(-100+400x-400)=0
We add all the numbers together, and all the variables
250x-(400x-500)+1000=0
We get rid of parentheses
250x-400x+500+1000=0
We add all the numbers together, and all the variables
-150x+1500=0
We move all terms containing x to the left, all other terms to the right
-150x=-1500
x=-1500/-150
x=+10
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