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Simplifying X + 21 + 2x = -1 + -2x + -8 Reorder the terms: 21 + X + 2x = -1 + -2x + -8 Reorder the terms: 21 + X + 2x = -1 + -8 + -2x Combine like terms: -1 + -8 = -9 21 + X + 2x = -9 + -2x Solving 21 + X + 2x = -9 + -2x 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 = -9 + -21 + -2x Reorder the terms: 21 + -21 + X + 2x = -9 + -21 + -2x Combine like terms: 21 + -21 = 0 0 + X + 2x = -9 + -21 + -2x X + 2x = -9 + -21 + -2x Combine like terms: -9 + -21 = -30 X + 2x = -30 + -2x Add '-2x' to each side of the equation. X + 2x + -2x = -30 + -2x + -2x Combine like terms: 2x + -2x = 0 X + 0 = -30 + -2x + -2x X = -30 + -2x + -2x Combine like terms: -2x + -2x = -4x X = -30 + -4x Simplifying X = -30 + -4x
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