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Simplifying 21 = 9 + -2x Solving 21 = 9 + -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 = 9 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 2x = 9 + 0 21 + 2x = 9 Add '-21' to each side of the equation. 21 + -21 + 2x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 9 + -21 2x = 9 + -21 Combine like terms: 9 + -21 = -12 2x = -12 Divide each side by '2'. x = -6 Simplifying x = -6
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