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129=73-n
We move all terms to the left:
129-(73-n)=0
We add all the numbers together, and all the variables
-(-1n+73)+129=0
We get rid of parentheses
1n-73+129=0
We add all the numbers together, and all the variables
n+56=0
We move all terms containing n to the left, all other terms to the right
n=-56
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