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a=2*3.14*8(8+12)
We move all terms to the left:
a-(2*3.14*8(8+12))=0
We add all the numbers together, and all the variables
a-(2*3.14*820)=0
We add all the numbers together, and all the variables
a-5149.6=0
We move all terms containing a to the left, all other terms to the right
a=5149.6
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