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a=0.5(12*4)+(12*9)
We move all terms to the left:
a-(0.5(12*4)+(12*9))=0
We add all the numbers together, and all the variables
a-(0.548+108)=0
We add all the numbers together, and all the variables
a-108.548=0
We move all terms containing a to the left, all other terms to the right
a=108.548
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