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Simplifying X + 3 + 2x = 21 Reorder the terms: 3 + X + 2x = 21 Solving 3 + X + 2x = 21 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 + 2x = 21 + -3 Reorder the terms: 3 + -3 + X + 2x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + X + 2x = 21 + -3 X + 2x = 21 + -3 Combine like terms: 21 + -3 = 18 X + 2x = 18 Add '-2x' to each side of the equation. X + 2x + -2x = 18 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 18 + -2x X = 18 + -2x Simplifying X = 18 + -2x
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