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-80=1a+72
We move all terms to the left:
-80-(1a+72)=0
We add all the numbers together, and all the variables
-(a+72)-80=0
We get rid of parentheses
-a-72-80=0
We add all the numbers together, and all the variables
-1a-152=0
We move all terms containing a to the left, all other terms to the right
-a=152
a=152/-1
a=-152
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