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3x + 2y = 18.......ec 1
-2x - 6y = -12....ec 2
la ecuación 1...... x 3
9x + 6y = 54 (+)
-2x - 6y = -12
-----------------
7x = 42x = 6
reemplazando en la ecuación 1
3*6 + 2y = 18
y = 0