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Simplifying X * 2 + 4x + -21 = 0 Reorder the terms for easier multiplication: 2X + 4x + -21 = 0 Reorder the terms: -21 + 2X + 4x = 0 Solving -21 + 2X + 4x = 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 + 2X + 21 + 4x = 0 + 21 Reorder the terms: -21 + 21 + 2X + 4x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 2X + 4x = 0 + 21 2X + 4x = 0 + 21 Combine like terms: 0 + 21 = 21 2X + 4x = 21 Add '-4x' to each side of the equation. 2X + 4x + -4x = 21 + -4x Combine like terms: 4x + -4x = 0 2X + 0 = 21 + -4x 2X = 21 + -4x Divide each side by '2'. X = 10.5 + -2x Simplifying X = 10.5 + -2x
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