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3(4a+9)-10(a-6)=1
We move all terms to the left:
3(4a+9)-10(a-6)-(1)=0
We multiply parentheses
12a-10a+27+60-1=0
We add all the numbers together, and all the variables
2a+86=0
We move all terms containing a to the left, all other terms to the right
2a=-86
a=-86/2
a=-43
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