Please, help me with this question, Coulomb's law for the magnitude of the force F between two particles with charges Q

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Please, help me with this question,
Coulomb's law for the magnitude of the force F between two
particles with charges Q and Q′ separated by a distance d is
|F|=K|QQ′|d2, where K=14πϵ0, and ϵ0=8.854×10−12C2/(N⋅m2) is the
permittivity of free space. Consider two point charges located on
the x axis: one charge, q1 = -12.0 nC , is located at x1 = -1.745 m
; the second charge, q2 = 30.0 nC , is at the origin (x = 0). Part
A What is (Fnet3)x, the x-component of the net force exerted by
these two charges on a third charge q3 = 54.5 nC placed between q1
and q2 at x3 = -1.245 m ? Your answer may be positive or negative,
depending on the direction of the force.