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3.5=a-5.5a
We move all terms to the left:
3.5-(a-5.5a)=0
We add all the numbers together, and all the variables
-(-4.5a)+3.5=0
We get rid of parentheses
4.5a+3.5=0
We move all terms containing a to the left, all other terms to the right
4.5a=-3.5
a=-3.5/4.5
a=-2.3333333333333/3
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