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5x - 2y = 26 => dikalikan 1 dapat dari y
6x + 2y = 40
5x - 2y = 26
__________ +
11x = 66
x = 6
3x +y = 20 , subtitusikan x = 6
3(6) + y = 20
18 + y = 20
y = 20 - 18
y = 2
Himpunan
x,y = {6, dan 2}