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2x+300=5x+400
We move all terms to the left:
2x+300-(5x+400)=0
We get rid of parentheses
2x-5x-400+300=0
We add all the numbers together, and all the variables
-3x-100=0
We move all terms containing x to the left, all other terms to the right
-3x=100
x=100/-3
x=-33+1/3
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