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9a-(-72)=0-8
We move all terms to the left:
9a-(-72)-(0-8)=0
We add all the numbers together, and all the variables
9a-(-72)-(-8)=0
We add all the numbers together, and all the variables
9a+80=0
We move all terms containing a to the left, all other terms to the right
9a=-80
a=-80/9
a=-8+8/9
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