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2w + z = 14 por 2
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3w - 2z = 7
4w + 2z = 28 sumando
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7w = 35
w = 5
reemplazando:
3(5) - 2z = 7
15 - 2z = 7
8 = 2z
4 = z
r + 3t = 7
r + t = 3 por -1
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r + 3t = 7
-r - t = -3 sumando
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2t = 4
t = 2
reemplazando:
r + 3(2) = 7
r + 6 = 7
r = 1