Răspuns:
3+(4x7-6x0):7=a-81:3:3:3
3+28:7=a-3
3+4=a-3
7=a-3
a=7+3
a=10
(344:4+bX6)+505:5=265
(344:4+bX6)+101=265
344:4+bX6=265-101
344:4+bX6=164
86+bx6=164
bx6=164-86
bx6=78
b=78:6
b=13
(48+5x2x3:2):c=81:9
(48+30:2):c=9
(48+15):c=9
63:c=9
c=63:9
c=7
d:(9x9-9x8)=11 rest 4
d:(81-72)=11 rest 4
d:9=11 rest 4
d=9x11+4
d=99+4
d=103
c+d=7+103=110
3a-b=3x10-13=30-13=17
Explicație pas cu pas: