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Simplifying 2x + 12 = -21 + -9x Reorder the terms: 12 + 2x = -21 + -9x Solving 12 + 2x = -21 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 12 + 2x + 9x = -21 + -9x + 9x Combine like terms: 2x + 9x = 11x 12 + 11x = -21 + -9x + 9x Combine like terms: -9x + 9x = 0 12 + 11x = -21 + 0 12 + 11x = -21 Add '-12' to each side of the equation. 12 + -12 + 11x = -21 + -12 Combine like terms: 12 + -12 = 0 0 + 11x = -21 + -12 11x = -21 + -12 Combine like terms: -21 + -12 = -33 11x = -33 Divide each side by '11'. x = -3 Simplifying x = -3
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