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4.5a=21.6
We move all terms to the left:
4.5a-(21.6)=0
We add all the numbers together, and all the variables
4.5a-21.6=0
We move all terms containing a to the left, all other terms to the right
4.5a=21.6
a=21.6/4.5
a=4+2.25/2.8125
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