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250-10x=200-5x
We move all terms to the left:
250-10x-(200-5x)=0
We add all the numbers together, and all the variables
-10x-(-5x+200)+250=0
We get rid of parentheses
-10x+5x-200+250=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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