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400=0.7x
We move all terms to the left:
400-(0.7x)=0
We add all the numbers together, and all the variables
-(+0.7x)+400=0
We get rid of parentheses
-0.7x+400=0
We move all terms containing x to the left, all other terms to the right
-0.7x=-400
x=-400/-0.7
x=571+0.3/0.7
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