Hi folks. The following formula has two frequently changing variables, the '84' and '75' values.

Does anyone know of a way I could automate a solution to this equation, so that I don't have to do the whole 9-yard calculation every time?

For example, '84' will probably soon become '81' and '75' will go to '76'.

Perhaps there's a small app that'll work it?

Equation:
[66.47 + (13.75 x 84) + (5 x 175 ) - (6.76 x 75] x 1.375 =