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2.64=0.4x
We move all terms to the left:
2.64-(0.4x)=0
We add all the numbers together, and all the variables
-(+0.4x)+2.64=0
We get rid of parentheses
-0.4x+2.64=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-2.64
x=-2.64/-0.4
x=6+0.24/0.4
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