Răspuns :
2xa+7x8=76
2xa+56=76
2aa=76-56
2xa=20
a=20:2
a=10
2xa-b=12
pt.ca a=10 avem
2x10-b=12
20-b=12
b=20-12
b=8
(a+b):9-14:7= inlocuim pe a si b
(10+8):9-2=
18:9-2=
2-2=0
2xa+56=76
2aa=76-56
2xa=20
a=20:2
a=10
2xa-b=12
pt.ca a=10 avem
2x10-b=12
20-b=12
b=20-12
b=8
(a+b):9-14:7= inlocuim pe a si b
(10+8):9-2=
18:9-2=
2-2=0
Stim 2xa+7x8=76 => 2xa+56=76=> 2xa=20=> a=10
2xa-b=12 => 20-b=12 => b=8 =>
18:9-14:7= 2-2=0
2xa-b=12 => 20-b=12 => b=8 =>
18:9-14:7= 2-2=0