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6y - x = 20
6(1/2x) - x = 20
3x - x = 20
2x = 20
x = 20/2
x = 10
karena sudah didapat x = 10 masukan x ke persamaan y = 1/2x untuk mencari y
y = 1/2x
y = 1/2 (10)
y = 5