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Question

If 12+1x=2, then x =

(a) 25
(b) 52
(c) 32
(d) 23

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Solution

(d) 23
12+1x=21x=21-121x=2×21×2-1×12×1=42-12=4-12 (Because LCM of 1,2 is 2)1x=32x=23

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