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Simplifying -2x + (12 + 9) = 2 + 9 + 2x Combine like terms: 12 + 9 = 21 -2x + (21) = 2 + 9 + 2x -2x + 21 = 2 + 9 + 2x Reorder the terms: 21 + -2x = 2 + 9 + 2x Combine like terms: 2 + 9 = 11 21 + -2x = 11 + 2x Solving 21 + -2x = 11 + 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 + -2x = 11 + 2x + -2x Combine like terms: -2x + -2x = -4x 21 + -4x = 11 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + -4x = 11 + 0 21 + -4x = 11 Add '-21' to each side of the equation. 21 + -21 + -4x = 11 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 11 + -21 -4x = 11 + -21 Combine like terms: 11 + -21 = -10 -4x = -10 Divide each side by '-4'. x = 2.5 Simplifying x = 2.5
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