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Simplifying -21 = -2x + 12 + -9 Reorder the terms: -21 = 12 + -9 + -2x Combine like terms: 12 + -9 = 3 -21 = 3 + -2x Solving -21 = 3 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -21 + 2x = 3 + -2x + 2x Combine like terms: -2x + 2x = 0 -21 + 2x = 3 + 0 -21 + 2x = 3 Add '21' to each side of the equation. -21 + 21 + 2x = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 3 + 21 2x = 3 + 21 Combine like terms: 3 + 21 = 24 2x = 24 Divide each side by '2'. x = 12 Simplifying x = 12
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