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3a-1.3a=0.25a
We move all terms to the left:
3a-1.3a-(0.25a)=0
We add all the numbers together, and all the variables
3a-1.3a-(+0.25a)=0
We add all the numbers together, and all the variables
1.7a-(+0.25a)=0
We get rid of parentheses
1.7a-0.25a=0
We add all the numbers together, and all the variables
1.45a=0
a=0/1.45
a=0
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