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Simplifying 3X + 9 = X + -21 Reorder the terms: 9 + 3X = X + -21 Reorder the terms: 9 + 3X = -21 + X Solving 9 + 3X = -21 + X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1X' to each side of the equation. 9 + 3X + -1X = -21 + X + -1X Combine like terms: 3X + -1X = 2X 9 + 2X = -21 + X + -1X Combine like terms: X + -1X = 0 9 + 2X = -21 + 0 9 + 2X = -21 Add '-9' to each side of the equation. 9 + -9 + 2X = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 2X = -21 + -9 2X = -21 + -9 Combine like terms: -21 + -9 = -30 2X = -30 Divide each side by '2'. X = -15 Simplifying X = -15
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