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2.5a=13.25
We move all terms to the left:
2.5a-(13.25)=0
We add all the numbers together, and all the variables
2.5a-13.25=0
We move all terms containing a to the left, all other terms to the right
2.5a=13.25
a=13.25/2.5
a=5+0.75/2.5
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