Evaluate the following :
1. -5/18 - 7/24 + 5/12.
2. -5/36 + 3/8 - -2/9.

1.  -518-724+512=-20-21+3072=-41+3072=-11722.  -536+38--29=-536+38+29=-10+27+1672=-10+4372=3372=1124

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