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Simplifying X + x + 3 + x + x = 2x + 21 Reorder the terms: 3 + X + x + x + x = 2x + 21 Combine like terms: x + x = 2x 3 + X + 2x + x = 2x + 21 Combine like terms: 2x + x = 3x 3 + X + 3x = 2x + 21 Reorder the terms: 3 + X + 3x = 21 + 2x Solving 3 + X + 3x = 21 + 2x Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + X + -3 + 3x = 21 + -3 + 2x Reorder the terms: 3 + -3 + X + 3x = 21 + -3 + 2x Combine like terms: 3 + -3 = 0 0 + X + 3x = 21 + -3 + 2x X + 3x = 21 + -3 + 2x Combine like terms: 21 + -3 = 18 X + 3x = 18 + 2x Add '-3x' to each side of the equation. X + 3x + -3x = 18 + 2x + -3x Combine like terms: 3x + -3x = 0 X + 0 = 18 + 2x + -3x X = 18 + 2x + -3x Combine like terms: 2x + -3x = -1x X = 18 + -1x Simplifying X = 18 + -1x
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