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200=15x-40
We move all terms to the left:
200-(15x-40)=0
We get rid of parentheses
-15x+40+200=0
We add all the numbers together, and all the variables
-15x+240=0
We move all terms containing x to the left, all other terms to the right
-15x=-240
x=-240/-15
x=+16
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