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2y - x = 10
yang atas dikali 1 yang bawah dikali 2
3y + 2x = 29
4y - 2x = 20
lalu ditambahkan dan 2x oromatis hilang
7y = 49
y = 7
2y - x = 10
2 x 7 - x = 10
14 - x = 10
4 = x