Nilai x yang memenuhi persamaan 1/5x + 1/2y = 1/2 1/5x - y = 1 2/5

1/5 x + 1/2 y = 1/2
1/5 x - y = 1 2/5
------------------------ ( - )
3/2 y = 1/2 - 7/5
3/2 y = -9/5
y = -9/5 × 2/3
y = -6/5

1/5 x + 1/2 y = 1/2
1/5 x + 1/2 (-6/5) = 1/2
1/5 x = 1/2 + 3/5
1/5 x = 11/5
x = 11