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5x2 - 2y2 = -20

7x2 - y2 = 152

Eq1 - 2*Eq2: -9x2 = -324

so that x2 = 36

Substituting the value of x2 in Eq1: 2y2 = 200 so that y2 = 100

The four solutions are (-6, -10), (-6, 10), (6, -10) and (6,10)

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