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5x - y = 14 | -2
3x + 2y = -2
-10x + 2y = -28
------------(-)
13x = 26
x = 26/13
= 2
5.(2) - y = 14
10 - y = 14
- y = 14 - 10
-y = 4
y = 4/-1
y = -4
=> 2.(2) + 4(-4)
=> 4 + (-16)= -12
jwbnnya C. -12