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Simplifying x + 21 = X + X + 36 Reorder the terms: 21 + x = X + X + 36 Reorder the terms: 21 + x = 36 + X + X Combine like terms: X + X = 2X 21 + x = 36 + 2X Solving 21 + x = 36 + 2X 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 + -21 + x = 36 + -21 + 2X Combine like terms: 21 + -21 = 0 0 + x = 36 + -21 + 2X x = 36 + -21 + 2X Combine like terms: 36 + -21 = 15 x = 15 + 2X Simplifying x = 15 + 2X
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