Respuesta:
x + y + z = 11
x - y + 32 = 13
Terminos (x) y (y) se cancelan
z + 32 = 11 + 13
z = 24 - 32
z = -8
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Sustituimos
x + y - 8 = 11
x + y = 11 + 8
x = -y + 19
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(-y + 19) - y + 32 = 13
-2y + 19 + 32 = 13
-2y = 13 - 19 - 32
-2y = -38
-y = -19
y = 19
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Sustituimos de nuevo
x + y + z = 11
= [-19 + (-19)] + 19 + -8 = 11
= 0 + 19 - 8 = 11
x - y + 32 = 13
= 0 - 19 + 32 = 13
x = 0
y = 19
z = -8
