This is an important though!
This an important statement but does, A + B =C?
From a mathematical statement, it is true but goes deeper than the statement.
I have worked in earth science all my life, pressure, temperature, elevation,bacteria, yeast, flow, pneumatic, hydraulic, electrical and electronics plus other things from an industrial stand point. But, I am not a cook!
This is why I think Chef Jacob's F-Step, full book of F-Step or Kenji's book "The Food Lab" are so important.
I have taught over 100 industrial process control technicians about process control (not important!) but what I taught them was to think out of the box, what did they feel, see or was indicated. Fix the problem with no call backs.
A + B = C is known as an engineer's best guess of the process. It is up to the user from experience or with experiments to equal C.
Think out the box!