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donat = y
x + 2y = 2000 (x3)
x + 3y = 2500 (x2)
menjadi spt ini
3x+6y = 6000
2x+6y = 5000 -
x = 1000
cari y
x + 2y = 2000
1000 + 2y = 2000
2y=2000-1000 =1000
y=1000/2 = 500
maka nilai x (pukis) = 1000
maka nila y (donat) = 500