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the force on q1 points in the -x direction

Homework Statement q1 = 25 μC at (0,1) and q2 = 20 μC find a.) q3 if q1 is in the negative x direction Homework Equations E=kq1q2/r^2 The Attempt at a Solution I keep trying to add vectors to find q3 ie ( -(25 μC) + 20 μC) and get 5 μC the book answer says 20 μC