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5.5(a-10)=90
We move all terms to the left:
5.5(a-10)-(90)=0
We multiply parentheses
5.5a-55-90=0
We add all the numbers together, and all the variables
5.5a-145=0
We move all terms containing a to the left, all other terms to the right
5.5a=145
a=145/5.5
a=26+2/5.5
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