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-9a+-12=8+-4a
We move all terms to the left:
-9a+-12-(8+-4a)=0
We add all the numbers together, and all the variables
-9a-(-4a)-12+=0
We add all the numbers together, and all the variables
-9a-(-4a)=0
We get rid of parentheses
-9a+4a=0
We add all the numbers together, and all the variables
-5a=0
a=0/-5
a=0
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