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2x - y = 5 (× 1) ---> 2x - y = 5
___________________________-
.......................................5y = - 5
.........................................y = -1
y = -1 substitusi ke peersamaan x + 2y = 0
x + 2y = 0
x + 2 (-1) =0
x - 2 =0
x = 2
maka himpunan penyeleasiannya { x , y} = { 2, -1}