1.х+7/12=3/4
2.х+5/24=7/12
3.х-1/6=7/9

[tex]x= \frac{3}{4}- \frac{7}{12} = \frac{9-7}{12} = \frac{2}{12} = \frac{1}{6} [/tex]

[tex]x= \frac{7}{12} - \frac{5}{24} = \frac{14-5}{24} = \frac{9}{24} [/tex]

[tex]x= \frac{7}{9} + \frac{1}{6} = \frac{14+3}{18}= \frac{17}{18} [/tex]

1. х+7/12=3/4. х=3/4-7/12. х=(9-7)/12=1/6.
2. х+5/24=7/12. х=7/12-5/24. х=(14-5)/24=9/24=3/8.
3. х-1/6=7/9. х=7/9+1/6. х=(14+3)/18=17/18.