Question

27 : | 26 + ( 6xa - 7x3 ) : 9 | + ( 13-2x2x3 )=2

Answer 1

27: /26+(6xa-7x3):9/ + (13-2x2x3) = 2
27:/26+(6xa-21):9/ + (13-12) = 2
27:/26+(6xa-21):9/ + 1 = 2
27:/26+(6xa-21):9/ = 1
/26+(6xa-21):9/ = 27:1 = 27

Varianta 1:
26+(6xa-21):9 = 27
(6xa-21):9 = 27-26=1
6xa-21 = 1x9 = 9
6xa = 21+9 = 30
a = 30:6
a = 5

Varianta 2:
26+(6xa-21):9 = -27
(6xa-21):9 = -27-26 = -53
6xa-21 = -53x9 = -477
6xa = -477+21 = -456
a = -456/6 
a = -76