2 lenses of power +10D. and -5d
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1/x = 1/10 - 1/6
1/x = (3-5)/30 = -2/30
= -1/15
x = -15
1/f = -15
f = -1/15 = -0.0666 m
f of lens having power +6D = 1/6 = +0.1666 m