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4000=15x+1000
We move all terms to the left:
4000-(15x+1000)=0
We get rid of parentheses
-15x-1000+4000=0
We add all the numbers together, and all the variables
-15x+3000=0
We move all terms containing x to the left, all other terms to the right
-15x=-3000
x=-3000/-15
x=+200
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