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Simplifying -3x * y * 3 + 7x * y * 3 + (-1x * y * 3) + (-3x * y * 3) = 0 Reorder the terms for easier multiplication: -3 * 3x * y + 7x * y * 3 + (-1x * y * 3) + (-3x * y * 3) = 0 Multiply -3 * 3 -9x * y + 7x * y * 3 + (-1x * y * 3) + (-3x * y * 3) = 0 Multiply x * y -9xy + 7x * y * 3 + (-1x * y * 3) + (-3x * y * 3) = 0 Reorder the terms for easier multiplication: -9xy + 7 * 3x * y + (-1x * y * 3) + (-3x * y * 3) = 0 Multiply 7 * 3 -9xy + 21x * y + (-1x * y * 3) + (-3x * y * 3) = 0 Multiply x * y -9xy + 21xy + (-1x * y * 3) + (-3x * y * 3) = 0 Reorder the terms for easier multiplication: -9xy + 21xy + (-1 * 3x * y) + (-3x * y * 3) = 0 Multiply -1 * 3 -9xy + 21xy + (-3x * y) + (-3x * y * 3) = 0 Multiply x * y -9xy + 21xy + (-3xy) + (-3x * y * 3) = 0 Reorder the terms for easier multiplication: -9xy + 21xy + (-3xy) + (-3 * 3x * y) = 0 Multiply -3 * 3 -9xy + 21xy + (-3xy) + (-9x * y) = 0 Multiply x * y -9xy + 21xy + (-3xy) + (-9xy) = 0 Combine like terms: -9xy + 21xy = 12xy 12xy + (-3xy) + (-9xy) = 0 Combine like terms: 12xy + (-3xy) = 9xy 9xy + (-9xy) = 0 Combine like terms: 9xy + (-9xy) = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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