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3(x/3 + y/4) = 3(-7/12)
x + 3y/4 = -7/4
x = -7/4 - 3y/4
2(x/2 + y/3) = 2(-1/6)
x + 2y/3 = -1/3
x = -1/3 - 2y/3
Igualas:
-7/4 - 3y/4 = -1/3 - 2y/3
12(-7/4 - 3y/4) = 12(-1/3 - 2y/3)
-21 - 9y = -4 - 8y
4 - 21 = 9y - 8y
-17 = y
x = -1/3 - 2y/3 = -1/3 + 34/3 = 33/3 = 11
x = 11, y = -17
El otro es igual
Saludos!