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y = 5 - x
2x -2y = 10
2x - 2(5 - x) = 10
2x -10 + 2x = 10
4x = 10 + 10
4x = 20
x = 5
lalu dimasukkan ke rumus awal untuk mencari nilai y
y = 5 -x
y = 5 - 5
y = 0