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so 3y - 3x = 4; 3(y - x) = 4; y - x = 1 and one third; infinte number of answers: eg y = 2 and one third, x = 1. Try y = 46 and a third, x = 45 Test -3 + 7 = 4 or -135 +139 =4 QED

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16y ago

What else can I help you with?