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6.1a=-18.3
We move all terms to the left:
6.1a-(-18.3)=0
We add all the numbers together, and all the variables
6.1a+18.3=0
We move all terms containing a to the left, all other terms to the right
6.1a=-18.3
a=-18.3/6.1
a=-3+3.5527136788005E-15/6.1
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