Hi I need help with the following question, make sure you use grade 12 physics method, nothing involved with uni or college physics I don't understand. Also level 4 answer for great rate.

Labelled diagram, given, required, starting equations, final equation, correct answer; proper variable, proper units, correct significant digits 6-> [5K Superposition principle] Two point charges, Q, =25 /C and 02 =+50 /C, are separated by a distance of 12 cm. The electric field at the point P is zero. How far from O, is P? 12 cm -25 uC +50 uC