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q1 + q2 = 7
r = 6×10^-2 m
F = 3×10^13 N
q1 = ___ ?, q2 = ___ ?
q1 + q2 = 7
q2 = 7 - q1
F = k q1 q2 / r^2
3×10^13 = 9×10^9 q1 (7 - q1) / (6×10^-2)^2 kali silang
(3×10^13) (36×10^-4) / 9×10^9 = 7 q1 - q1^2
12 = 7 q1 - q1^2
q1^2 - 7 q1 - 12 = 0
(q1 - 3) (q1 - 4) = 0
q1 = 3 C --> q2 = 4 C
atau
q1 = 4.C --> q2 = 3 C.
Jadi besar muatan itu adalah 3 C dan 4 C. ← jawaban
Ok, mudah-mudahan cukup jelas.