In the expression 6n+3 the variable or the unknown is n
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n is the variable.
6n+3=15 6n+3-3=15-3=12 6n = 12 n=12/6 = 2
6n - 4 - 3 = 3n + 10 + 4n -7 = 7n - 6n + 10 -17 = n
It is: 3
3 is called the constant term and the 6n is called the linear term.