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Simplifying 2X + 21 = 4X Reorder the terms: 21 + 2X = 4X Solving 21 + 2X = 4X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-4X' to each side of the equation. 21 + 2X + -4X = 4X + -4X Combine like terms: 2X + -4X = -2X 21 + -2X = 4X + -4X Combine like terms: 4X + -4X = 0 21 + -2X = 0 Add '-21' to each side of the equation. 21 + -21 + -2X = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -2X = 0 + -21 -2X = 0 + -21 Combine like terms: 0 + -21 = -21 -2X = -21 Divide each side by '-2'. X = 10.5 Simplifying X = 10.5
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