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A. B. C (3x4 - 2 x -5 : 3x1 - 2x4)=
2x - y = 4. (12 - -10 : 3 - 8=22 : -5=-4,4
P. Q. R
mncri X:5x1 - 4x4 : 3x1 - 2x4 =
5 - 16 : 3 - 8 =-11 : -5= 2,2
maka nilai x dan y = -4,4 dan 2,2