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0.25a-2.1=0.5a-4.1
We move all terms to the left:
0.25a-2.1-(0.5a-4.1)=0
We get rid of parentheses
0.25a-0.5a+4.1-2.1=0
We add all the numbers together, and all the variables
-0.25a+2=0
We move all terms containing a to the left, all other terms to the right
-0.25a=-2
a=-2/-0.25
a=+8
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