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n/3
The unknown variable in the expression: 6n+3 is n
It is: 3/n
n is the variable.
In the expression 6n+3 the variable or the unknown is n
-15 ----- n (-15 over a variable)
8-3/n
x = 6n/42 x = n/7
The expression is: n/8
N
It is n
n+81
n/8 + 3