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a=72a-1
We move all terms to the left:
a-(72a-1)=0
We get rid of parentheses
a-72a+1=0
We add all the numbers together, and all the variables
-71a+1=0
We move all terms containing a to the left, all other terms to the right
-71a=-1
a=-1/-71
a=1/71
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