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5x + 7y = -12 (dikali 3)
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15x + 20y = -5
15x + 21y = -36
----------------------- -
-y = 31
y = -31
3x + 4y = -1
3x + 4(-31)= -1
3x + (-124)= -1
3x = -1 +124
3x = 123
x = 123/3
x = 41