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1=4x+400
We move all terms to the left:
1-(4x+400)=0
We get rid of parentheses
-4x-400+1=0
We add all the numbers together, and all the variables
-4x-399=0
We move all terms containing x to the left, all other terms to the right
-4x=399
x=399/-4
x=-99+3/4
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