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400=3000+100x
We move all terms to the left:
400-(3000+100x)=0
We add all the numbers together, and all the variables
-(100x+3000)+400=0
We get rid of parentheses
-100x-3000+400=0
We add all the numbers together, and all the variables
-100x-2600=0
We move all terms containing x to the left, all other terms to the right
-100x=2600
x=2600/-100
x=-26
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