phyysics-please help!

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an arrangement of four charged particles, with angle θ = 34.0 ˚ and distance d = 1.50 cm. Particle 2 has charge q2 = 8.00 × 10-19 C; particles 3 and 4 have charges q3 = q4 = -1.60 × 10-19 C. What is the distance D between the origin and particle 2 if the net electrostatic force on particle 1 due to the other particles is zero?

The set up of the particles is q1(negative d) and q2(positive D) are on the x axis with q3(positive) and q4(negative)with the angle theta with the x axis.

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