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a+1.618a=100.31
We move all terms to the left:
a+1.618a-(100.31)=0
We add all the numbers together, and all the variables
2.618a-100.31=0
We move all terms containing a to the left, all other terms to the right
2.618a=100.31
a=100.31/2.618
a=38+0.82600000000001/2.618
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