To find an approximate solution to the equation 19 + 21nx = 25, you need to isolate the variable "x" on one side of the equation.
Here are the steps you can follow:
Subtract 19 from both sides of the equation:
21nx = 6
Divide both sides by 21n:
x = 6 / (21n)
Note: If the value of "n" is not specified, you cannot find an exact solution. Instead, you can only find an approximate solution for a given value of "n".
Plug in the value of "n" to get an approximate answer. For example, if "n" equals 1, then:
x = 6 / (21*1) = 0.2857142857 (rounded to 10 decimal places)
So, an approximate solution to the equation 19 + 21nx = 25 is x = 0.2857142857 (for n = 1).