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0.18-0.75a=0.405
We move all terms to the left:
0.18-0.75a-(0.405)=0
We add all the numbers together, and all the variables
-0.75a-0.225=0
We move all terms containing a to the left, all other terms to the right
-0.75a=0.225
a=0.225/-0.75
a=-0.225/0.75
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