Question 814731
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Hi,
What is 8N-21=35?
the Idea is to Isolate N on one side of the Equation, 
so You can read N = a number
8N-21=35
8N-21 + 21 = 35 + 21
8N = 56
{{{8*N/8 = 56/8}}}
    N = 7