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250-5x=200-4x
We move all terms to the left:
250-5x-(200-4x)=0
We add all the numbers together, and all the variables
-5x-(-4x+200)+250=0
We get rid of parentheses
-5x+4x-200+250=0
We add all the numbers together, and all the variables
-1x+50=0
We move all terms containing x to the left, all other terms to the right
-x=-50
x=-50/-1
x=+50
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