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a=120.5a
We move all terms to the left:
a-(120.5a)=0
We add all the numbers together, and all the variables
a-(+120.5a)=0
We get rid of parentheses
a-120.5a=0
We add all the numbers together, and all the variables
-119.5a=0
a=0/-119.5
a=0
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