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400=25x+75
We move all terms to the left:
400-(25x+75)=0
We get rid of parentheses
-25x-75+400=0
We add all the numbers together, and all the variables
-25x+325=0
We move all terms containing x to the left, all other terms to the right
-25x=-325
x=-325/-25
x=+13
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