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6a+8+12a+6a+8+10a-4=102
We move all terms to the left:
6a+8+12a+6a+8+10a-4-(102)=0
We add all the numbers together, and all the variables
34a-90=0
We move all terms containing a to the left, all other terms to the right
34a=90
a=90/34
a=2+11/17
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