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2a-1=3.5a-3a=
We move all terms to the left:
2a-1-(3.5a-3a)=0
We add all the numbers together, and all the variables
2a-(+0.5a)-1=0
We get rid of parentheses
2a-0.5a-1=0
We add all the numbers together, and all the variables
1.5a-1=0
We move all terms containing a to the left, all other terms to the right
1.5a=1
a=1/1.5
a=1/1.5
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