7
3n-6+6=15+6
3n=21
3n/3=21/3
n=7
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It is an equation and the value of n is 6
It is an equation and the value of d is 2
There's no way to calculate it without an equation that describes the relationship between 'x' and 'y'.
This is called an equation....
8 = 15 - 7 8 = 8 Yes it is an equation.