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Simplifying -21 + -11x = -12x + 9 Reorder the terms: -21 + -11x = 9 + -12x Solving -21 + -11x = 9 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. -21 + -11x + 12x = 9 + -12x + 12x Combine like terms: -11x + 12x = 1x -21 + 1x = 9 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 + 1x = 9 + 0 -21 + 1x = 9 Add '21' to each side of the equation. -21 + 21 + 1x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 9 + 21 1x = 9 + 21 Combine like terms: 9 + 21 = 30 1x = 30 Divide each side by '1'. x = 30 Simplifying x = 30
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