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Solve system by elimination
20x-12y=-20
-10x+6y=10

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10x+6y=10 / * 2 => 20x + 12y = 20; but, 20x - 12y = -20 => 40x = 0 => x = 0; 12y = 20 => y = 20 / 12 => y = 1,(6).

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