Răspuns:
26+(6xh-7x3):9=27
26+(6xh-21):9=27
(6xh-21):9=27-26
(6xh-21):9=1
(6xh-21)=1x9
6xh-21=9
6xh=21+9
6xh=30
h=30:6
h=5