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400=0.99*400x
We move all terms to the left:
400-(0.99*400x)=0
We add all the numbers together, and all the variables
-(+0.99*400x)+400=0
We get rid of parentheses
-0.99*400x+400=0
We move all terms containing x to the left, all other terms to the right
-0.99*400x=-400
x=-400/1
x=-400
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