..
→ Ai scris greșit ecuația .... Dar am vazut in comentarii .....
54 — 4 • 3 : [ 2 • 11 — 5 — ( 5 • 4 — a ) ] + 14 • 2 = 76 = >
54 — 12 : [ 22 — 5 — ( 20 — a ) ] + 28 = 76 = >
54 — 12 : [ 17 — ( 20 — a ) ] = 76 — 28 = >
54 — 12 : [ 17 — ( 20 — a ) ] = 48 = >
54 — 48 = 12 : 17 — ( 20 - a ) = >
12 : 17 — ( 20 — a ) = 6 = >
17 — ( 20 — a ) = 12 : 6 = >
17 — ( 20 — a ) = 2 = >
17 — 2 = 20 — a = >
20 — a = 15 = >
a = 20 — 15 = >
a = 5 = >
S = { 5 }
..
