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5x +3y = 26 Ι x3 Ι 15x +9y = 78 -
-19y = 57
y = -3
3x -2y = 27
3x -2(-3) = 27
3x +6 = 27
3x = 27 -6
3x = 21
x = 7
Maka, nilai :
x -2y
= 7 -2(-3)
= 7 +6
= 13
Itu jawabannya.