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200+50x=100+75x
We move all terms to the left:
200+50x-(100+75x)=0
We add all the numbers together, and all the variables
50x-(75x+100)+200=0
We get rid of parentheses
50x-75x-100+200=0
We add all the numbers together, and all the variables
-25x+100=0
We move all terms containing x to the left, all other terms to the right
-25x=-100
x=-100/-25
x=+4
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