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12a-a=-5-4
We move all terms to the left:
12a-a-(-5-4)=0
We add all the numbers together, and all the variables
12a-a-(-9)=0
We add all the numbers together, and all the variables
11a+9=0
We move all terms containing a to the left, all other terms to the right
11a=-9
a=-9/11
a=-9/11
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