Is there a way to shorten repetitive math

Question

I have a math equation that is repeated for multiple variable but each time only the output and 1 variable is changed

R1S2NCtxt.Text = ((((ATT * R1S2) - EDEF) * 0.8M) + ((ATT * Pierce) - EDEF * ERES)).ToString();
R2S2NCtxt.Text = ((((ATT * R2S2) - EDEF) * 0.8M) + ((ATT * Pierce) - EDEF * ERES)).ToString();
R3S2NCtxt.Text = ((((ATT * R3S2) - EDEF) * 0.8M) + ((ATT * Pierce) - (EDEF * ERES))).ToString();

This is repeated multiple times is there a way to shorten this or repeat formula with different variables thx

Answer 1

You could use a function to get rid of copy pasting code.

Example:

private string Calculate(float number) {
    return  ((((ATT * number) - EDEF) * 0.8M) + ((ATT * Pierce) - EDEF * ERES)).ToString();
}

Now you can call that function with:

R1S2NCtxt.Text = Calculate(R1S2);
R2S2NCtxt.Text = Calculate(R2S2);
R3S2NCtxt.Text = Calculate(R3S2);

Answer 2

decimal Equation(decimal value)
    => (((ATT * value) - EDEF) * 0.8M) + ((ATT * Pierce) - EDEF * ERES);

Then:

R1S2NCtxt.Text = Equation(R1S2).ToString();

Assuming R1S2 is decimal ; if not then just amend the type of value accordingly.