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5.5a+10=70.5
We move all terms to the left:
5.5a+10-(70.5)=0
We add all the numbers together, and all the variables
5.5a-60.5=0
We move all terms containing a to the left, all other terms to the right
5.5a=60.5
a=60.5/5.5
a=11
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