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25x+250=20x+400
We move all terms to the left:
25x+250-(20x+400)=0
We get rid of parentheses
25x-20x-400+250=0
We add all the numbers together, and all the variables
5x-150=0
We move all terms containing x to the left, all other terms to the right
5x=150
x=150/5
x=30
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