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9.1+4.5a-2.5a=11.1
We move all terms to the left:
9.1+4.5a-2.5a-(11.1)=0
We add all the numbers together, and all the variables
2a-2=0
We move all terms containing a to the left, all other terms to the right
2a=2
a=2/2
a=1
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