72 + 49 = 121
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5/9+1/8=40/72+9/72 Common denominator is 72 since 8 and 9 can go into it evenly. 49/72 is simplest because 49 and 72 do not have a common factor other than 1.
It is 72 = 49.
LCD(49, 72) = 3528
72 = 49
108-((121+49)-72)