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Simplifying 3X + -12 = X + 21 Reorder the terms: -12 + 3X = X + 21 Reorder the terms: -12 + 3X = 21 + X Solving -12 + 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. -12 + 3X + -1X = 21 + X + -1X Combine like terms: 3X + -1X = 2X -12 + 2X = 21 + X + -1X Combine like terms: X + -1X = 0 -12 + 2X = 21 + 0 -12 + 2X = 21 Add '12' to each side of the equation. -12 + 12 + 2X = 21 + 12 Combine like terms: -12 + 12 = 0 0 + 2X = 21 + 12 2X = 21 + 12 Combine like terms: 21 + 12 = 33 2X = 33 Divide each side by '2'. X = 16.5 Simplifying X = 16.5
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