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Simplifying X + 3 + 3x = x + 15 Reorder the terms: 3 + X + 3x = x + 15 Reorder the terms: 3 + X + 3x = 15 + x Solving 3 + X + 3x = 15 + x 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 = 15 + -3 + x Reorder the terms: 3 + -3 + X + 3x = 15 + -3 + x Combine like terms: 3 + -3 = 0 0 + X + 3x = 15 + -3 + x X + 3x = 15 + -3 + x Combine like terms: 15 + -3 = 12 X + 3x = 12 + x Add '-3x' to each side of the equation. X + 3x + -3x = 12 + x + -3x Combine like terms: 3x + -3x = 0 X + 0 = 12 + x + -3x X = 12 + x + -3x Combine like terms: x + -3x = -2x X = 12 + -2x Simplifying X = 12 + -2x
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