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1040.x=640.x
We move all terms to the left:
1040.x-(640.x)=0
We add all the numbers together, and all the variables
1040.x-(+640.x)=0
We get rid of parentheses
1040.x-640.x=0
We add all the numbers together, and all the variables
400x=0
x=0/400
x=0
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