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Simplifying X2 + 7x + 21 = 0 Reorder the terms: 21 + X2 + 7x = 0 Solving 21 + X2 + 7x = 0 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + X2 + -21 + 7x = 0 + -21 Reorder the terms: 21 + -21 + X2 + 7x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + X2 + 7x = 0 + -21 X2 + 7x = 0 + -21 Combine like terms: 0 + -21 = -21 X2 + 7x = -21 Add '-7x' to each side of the equation. X2 + 7x + -7x = -21 + -7x Combine like terms: 7x + -7x = 0 X2 + 0 = -21 + -7x X2 = -21 + -7x Simplifying X2 = -21 + -7x Reorder the terms: 21 + X2 + 7x = -21 + -7x + 21 + 7x Reorder the terms: 21 + X2 + 7x = -21 + 21 + -7x + 7x Combine like terms: -21 + 21 = 0 21 + X2 + 7x = 0 + -7x + 7x 21 + X2 + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 21 + X2 + 7x = 0 The solution to this equation could not be determined.
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