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Simplifying Y2 + -4y = -21 Solving Y2 + -4y = -21 Solving for variable 'Y'. Move all terms containing Y to the left, all other terms to the right. Add '4y' to each side of the equation. Y2 + -4y + 4y = -21 + 4y Combine like terms: -4y + 4y = 0 Y2 + 0 = -21 + 4y Y2 = -21 + 4y Simplifying Y2 = -21 + 4y Reorder the terms: 21 + Y2 + -4y = -21 + 4y + 21 + -4y Reorder the terms: 21 + Y2 + -4y = -21 + 21 + 4y + -4y Combine like terms: -21 + 21 = 0 21 + Y2 + -4y = 0 + 4y + -4y 21 + Y2 + -4y = 4y + -4y Combine like terms: 4y + -4y = 0 21 + Y2 + -4y = 0 The solution to this equation could not be determined.
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