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Simplifying -1x + -21 = 2x + 9 Reorder the terms: -21 + -1x = 2x + 9 Reorder the terms: -21 + -1x = 9 + 2x Solving -21 + -1x = 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 + -1x + -2x = 9 + 2x + -2x Combine like terms: -1x + -2x = -3x -21 + -3x = 9 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + -3x = 9 + 0 -21 + -3x = 9 Add '21' to each side of the equation. -21 + 21 + -3x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -3x = 9 + 21 -3x = 9 + 21 Combine like terms: 9 + 21 = 30 -3x = 30 Divide each side by '-3'. x = -10 Simplifying x = -10
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