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100+35n=72+42n
We move all terms to the left:
100+35n-(72+42n)=0
We add all the numbers together, and all the variables
35n-(42n+72)+100=0
We get rid of parentheses
35n-42n-72+100=0
We add all the numbers together, and all the variables
-7n+28=0
We move all terms containing n to the left, all other terms to the right
-7n=-28
n=-28/-7
n=+4
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