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Simplifying X + -2x + 21 = 6 Reorder the terms: 21 + X + -2x = 6 Solving 21 + X + -2x = 6 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 + X + -21 + -2x = 6 + -21 Reorder the terms: 21 + -21 + X + -2x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + X + -2x = 6 + -21 X + -2x = 6 + -21 Combine like terms: 6 + -21 = -15 X + -2x = -15 Add '2x' to each side of the equation. X + -2x + 2x = -15 + 2x Combine like terms: -2x + 2x = 0 X + 0 = -15 + 2x X = -15 + 2x Simplifying X = -15 + 2x
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