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Verified answer

А)x-4/7=3/7
x=4/7+3/7
x=7/7=1

б)x+11/12=11/12
x=11/12-11/12
x=0

в)х+1/4=1/2
х=-1/4+1/2
x=-1,4+2/4
х=1/4

г)5/8+x=7/8
х=7/8-5/8
x=2/8=1/4

д)9/17-x=5/17
-x=5/17-9/17
-x=-4/17
x=4/17

e)x-4/9=5/9
x=5/9+4/9
x=9/9
x=1