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5.5=a-3.2
We move all terms to the left:
5.5-(a-3.2)=0
We get rid of parentheses
-a+3.2+5.5=0
We add all the numbers together, and all the variables
-1a+8.7=0
We move all terms containing a to the left, all other terms to the right
-a=-8.7
a=-8.7/-1
a=8+0.7/1
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