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6520=x+0.4x
We move all terms to the left:
6520-(x+0.4x)=0
We add all the numbers together, and all the variables
-(+1.4x)+6520=0
We get rid of parentheses
-1.4x+6520=0
We move all terms containing x to the left, all other terms to the right
-1.4x=-6520
x=-6520/-1.4
x=4657+0.20000000000073/1.4
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