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x + 2y = 10 ..(2) ⇒x = 10 - 2y
⇔x + x - 8 = 10
⇔2x = 18
⇔x = 9
2y = x - 8
⇔2y = 10 -2y - 8
⇔4y = 2
⇔y = 1/2