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It is a linear equation in one unknown variable, n.
A system of linear equations that has one unknown is a set of equations that all depend on the same variable. An example is y = 1 + 3x and y = 4 + 7x.
You cannot solve one linear equation with two unknown variables.
It is not possible to solve one linear equation in two unknown variables. Another, independent equation is required.
It is a linear equation in two unknown variables, y and c. One linear equation in two unknowns cannot be solved, it can only be arranged so that one or the other variable is the subject of the equation. However, that requires you to identify which variable is to be made the subject of the equation.