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7/8-5/6+2/3
=7/8-(5/6-2/3)
=7/8-(5/6-4/6)
=7/8-1/6
=21/24-4/24
=17/24
1/2-(1/4+1/5)
=1/2-1/4-1/5
=2/4-1/4-1/5
=1/4-1/5
=5/20-4/20
=1/20
=7/8-(5/6-2/3)
=7/8-(5/6-4/6)
=7/8-1/6
=21/24-4/24
=17/24
1/2-(1/4+1/5)
=1/2-1/4-1/5
=2/4-1/4-1/5
=1/4-1/5
=5/20-4/20
=1/20
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