21. Simplify
(6^-1 - 8^-1) + (2^-1 - 3^-1)^-1
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=(1/6-1/8)+1/(1/2-1/3)
by LCM method
=(4-3)/24+1/(3-2)/6
=1/24+1/(1/6)
=1/24+6
=144+1/6
=145/6
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