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3x + 5y = 7 |x2| 6x + 10y = 14
6x + 10y = 14
6x + 9y = 12
_____________ -
y = 2
6x + 10. 2 = 14
6x + 20 = 14
6x = 14 - 20
6x = -6
x = -1
6xy = 6 . -1 . 2 = 6 . -2 = -12 (A)