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b)15/18-16/18=-1/18
c)-77^5/6
d)3/5-5/3=9/15-25/15=-16/15=1^1/15
e)20/9+17/12=80/36+51/36=131/36
f)8/7+8/3=24/21+56/21=80/21
g)17/5-17/3=51/15-85/15=-34/15
h)13/3-37/15=65/15-37/15=28/15