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(200x+400)=3
We move all terms to the left:
(200x+400)-(3)=0
We get rid of parentheses
200x+400-3=0
We add all the numbers together, and all the variables
200x+397=0
We move all terms containing x to the left, all other terms to the right
200x=-397
x=-397/200
x=-1+197/200
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