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12a+24a+16+10a-4=102
We move all terms to the left:
12a+24a+16+10a-4-(102)=0
We add all the numbers together, and all the variables
46a-90=0
We move all terms containing a to the left, all other terms to the right
46a=90
a=90/46
a=1+22/23
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