Pick x1, a number between 0 and x.Pick x2, a number between 0 and x.Your longitude is (1/2)x1 + original longitude and your latitude is (1/2)x2 + original latitude.
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Pick x1, a number between 0 and x.Pick x2, a number between 0 and x.Your longitude is (1/2)x1 + original longitude and your latitude is (1/2)x2 + original latitude.