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3.1a+5.37=-5.17
We move all terms to the left:
3.1a+5.37-(-5.17)=0
We add all the numbers together, and all the variables
3.1a+10.54=0
We move all terms containing a to the left, all other terms to the right
3.1a=-10.54
a=-10.54/3.1
a=-3+1/2.5
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