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=A-6.4
We move all terms to the left:
-(A-6.4)=0
We get rid of parentheses
-A+6.4=0
We add all the numbers together, and all the variables
-1A+6.4=0
We move all terms containing A to the left, all other terms to the right
-A=-6.4
A=-6.4/-1
A=6+0.4/1
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