3 6/7 х - 7/9 х+4 4/63=3 54/63 х - 49/63 х +4 4/63=3 5/63 х +4 4/63
или
3 6/7 <span>х - 7/9 х+4 4/63 х=3 54/63 х - 49/63 х +4 4/63 х=3 5/63 х +4 4/63 х=7 9/63 х=7 1/7 х</span>
7/14+3/49÷(9-8 13/14)-2/7=1 1/14
9-8 13/14= 1/14
3/49÷1/14=3/49×14/1=42/49=6/7
7/14+6/7=7+12/14=19/14=1 5/14
1 5/14 - 2/7=19/14-2/7=19-4/14=15/14
=1 1/14
<span>-9,7+(-89,35)-7676+(-8989)=</span>-255590.3