Find the sum of (a)-13 3/4+ 11 1 / 2,(b) 8/13+3/11,(c) 7/3+-4/3
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(a)-13 3/4+ 11 1 / 2
=> -55/4 + 23/2
LCM is 4
=> (-55 + 46)/4= -9/4
(b) 8/13+3/11
LCM is 143
=>( 88 + 39)/143= 127/143
(c) 7/3+(-4/3)
LCM is 3
=> (7 - 4)/3= 3/3=1
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