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6n-9-20=4-5n
We move all terms to the left:
6n-9-20-(4-5n)=0
We add all the numbers together, and all the variables
6n-(-5n+4)-9-20=0
We add all the numbers together, and all the variables
6n-(-5n+4)-29=0
We get rid of parentheses
6n+5n-4-29=0
We add all the numbers together, and all the variables
11n-33=0
We move all terms containing n to the left, all other terms to the right
11n=33
n=33/11
n=3
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