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(-4.5)A=4/7
We move all terms to the left:
(-4.5)A-(4/7)=0
We add all the numbers together, and all the variables
(-4.5)A-(+4/7)=0
We multiply parentheses
-4.5A-(+4/7)=0
We get rid of parentheses
-4.5A-4/7=0
We multiply all the terms by the denominator
-(4.5A)*7-4=0
We add all the numbers together, and all the variables
-(+4.5A)*7-4=0
We multiply parentheses
-28A-4=0
We move all terms containing A to the left, all other terms to the right
-28A=4
A=4/-28
A=-1/7
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