Explicație pas cu pas:
Afla necunoscuta:
a : a + 3a - 2a = 5
1+a = 5
a= 5-1 = 4
a x 0 + 2a : 1 - a + 3a =8
0+2a-a+3a = 8
4a= 8
a= 8:4 = 2
48 : 4 + {12 +[60 : 5 - (12 : a + 5 ) : 3 ] :5} : 7 = 14
12 + {12+[12-(12:a+5):3]:5}:7 = 14
{12+[12-(12:a+5):3]:5}:7 = 14-12 = 2
12+[12-(12:a+5):3]:5 = 2× 7= 14
[12-(12:a+5):3]:5 = 14-12 = 2
12-(12:a+5):3 = 2×5 = 10
(12:a+5):3 = 12-10 = 2
12:a+5 = 2×3 = 6
12:a = 6-5 = 1
a= 12: 1 = 12
