7/8+1/6-(1-1/4),1/2-(1/14+2/7)-1/9,
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7/8+1/6-(1-1/4)
=7/8+1/6-3/4
=7/8-3/4+1/6
=1/8+1/6
=7/24
1/2-(1/14+2/7)-1/9
=1/2-(1/14+4/14)-1/9
=1/2-5/14-1/9
=7/14-5/14-1/9
=1/7-1/9
=9/63-7/63
=2/63
=7/8+1/6-3/4
=7/8-3/4+1/6
=1/8+1/6
=7/24
1/2-(1/14+2/7)-1/9
=1/2-(1/14+4/14)-1/9
=1/2-5/14-1/9
=7/14-5/14-1/9
=1/7-1/9
=9/63-7/63
=2/63
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