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6.4=0.4x
We move all terms to the left:
6.4-(0.4x)=0
We add all the numbers together, and all the variables
-(+0.4x)+6.4=0
We get rid of parentheses
-0.4x+6.4=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-6.4
x=-6.4/-0.4
x=+16
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