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12.1+a=7.0712.89
We move all terms to the left:
12.1+a-(7.0712.89)=0
We add all the numbers together, and all the variables
a+12.1-(6.293368)=0
We add all the numbers together, and all the variables
a+5.806632=0
We move all terms containing a to the left, all other terms to the right
a=-5.806632
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