add this rational number7/-18and 8/27
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we can write 7/-18 as -7/18.
Now,-7/18 + 8/27
LCM of 18 and 27=54
So,-7/18×3/3=-21/54 and 8/27×2/2=16/54
Now,-21/54+16/54
=>(-5/54)
So,the answer is -5/54
HOPE IT HELPS YOU
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