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a-8-2+4+8a-10a+9a-5=-a+a-a+23-12-2+4a
We move all terms to the left:
a-8-2+4+8a-10a+9a-5-(-a+a-a+23-12-2+4a)=0
We add all the numbers together, and all the variables
a+8a-10a+9a-(3a+9)-8-2+4-5=0
We add all the numbers together, and all the variables
8a-(3a+9)-11=0
We get rid of parentheses
8a-3a-9-11=0
We add all the numbers together, and all the variables
5a-20=0
We move all terms containing a to the left, all other terms to the right
5a=20
a=20/5
a=4
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