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Simplifying X + 21 + 3x = -12 + -3x + -31 Reorder the terms: 21 + X + 3x = -12 + -3x + -31 Reorder the terms: 21 + X + 3x = -12 + -31 + -3x Combine like terms: -12 + -31 = -43 21 + X + 3x = -43 + -3x Solving 21 + X + 3x = -43 + -3x 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 + 3x = -43 + -21 + -3x Reorder the terms: 21 + -21 + X + 3x = -43 + -21 + -3x Combine like terms: 21 + -21 = 0 0 + X + 3x = -43 + -21 + -3x X + 3x = -43 + -21 + -3x Combine like terms: -43 + -21 = -64 X + 3x = -64 + -3x Add '-3x' to each side of the equation. X + 3x + -3x = -64 + -3x + -3x Combine like terms: 3x + -3x = 0 X + 0 = -64 + -3x + -3x X = -64 + -3x + -3x Combine like terms: -3x + -3x = -6x X = -64 + -6x Simplifying X = -64 + -6x
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