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2(12+8a)+2(3a-9)=12a-10+8a
We move all terms to the left:
2(12+8a)+2(3a-9)-(12a-10+8a)=0
We add all the numbers together, and all the variables
2(8a+12)+2(3a-9)-(20a-10)=0
We multiply parentheses
16a+6a-(20a-10)+24-18=0
We get rid of parentheses
16a+6a-20a+10+24-18=0
We add all the numbers together, and all the variables
2a+16=0
We move all terms containing a to the left, all other terms to the right
2a=-16
a=-16/2
a=-8
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