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13a=76.5
We move all terms to the left:
13a-(76.5)=0
We add all the numbers together, and all the variables
13a-76.5=0
We move all terms containing a to the left, all other terms to the right
13a=76.5
a=76.5/13
a=5+7.66666666667/8.66666666667
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