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Ec2) 2x - 2y + 3z = 18 multipliquemos por 2: 4x - 4y+ 6z = 36 (Ec 5)
Ec3) 3x + 4y + z = 48 multipliquemos por 3: 9x +12y + 3z = 144 (Ec 6)
Sumamos: Ec 5 + Ec 3 ; 4x + 3x - 4y + 4y + 6z + z = 36 + 48
7x + 7z = 84 (Ec 7)
Restemos Ec 3 - Ec 4: 3x - 3x + 4y -9y + z + 6z = 48 - 45
-5y + 7z = 3 (Ec 8)
Restemos E 6 - Ec 2: 9x - 2x + 12y + 2y + 3z - 3z = 144 - 18
7x + 14y = 126 (Ec 9)
Sumamos Ec 9 + Ec 7: 14x + 14y + 7z = 210
168 + 7z = 210 por Ec 7
7z = 210 - 168
7z = 42
z = 6
remplazamos hallamos x= 6 e y = 9
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