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4a-9(a-4(a-5))=-72
We move all terms to the left:
4a-9(a-4(a-5))-(-72)=0
We add all the numbers together, and all the variables
4a-9(a-4(a-5))+72=0
We move all terms containing a to the left, all other terms to the right
4a-9(a-4(a-5))=-72
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