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Simplifying X + 21 + 2x = (-7) + -2x + -12 Reorder the terms: 21 + X + 2x = (-7) + -2x + -12 21 + X + 2x = -7 + -2x + -12 Reorder the terms: 21 + X + 2x = -7 + -12 + -2x Combine like terms: -7 + -12 = -19 21 + X + 2x = -19 + -2x Solving 21 + X + 2x = -19 + -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 = -19 + -21 + -2x Reorder the terms: 21 + -21 + X + 2x = -19 + -21 + -2x Combine like terms: 21 + -21 = 0 0 + X + 2x = -19 + -21 + -2x X + 2x = -19 + -21 + -2x Combine like terms: -19 + -21 = -40 X + 2x = -40 + -2x Add '-2x' to each side of the equation. X + 2x + -2x = -40 + -2x + -2x Combine like terms: 2x + -2x = 0 X + 0 = -40 + -2x + -2x X = -40 + -2x + -2x Combine like terms: -2x + -2x = -4x X = -40 + -4x Simplifying X = -40 + -4x
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