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Simplifying -9x + -21 = 5x + 21 Reorder the terms: -21 + -9x = 5x + 21 Reorder the terms: -21 + -9x = 21 + 5x Solving -21 + -9x = 21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -21 + -9x + -5x = 21 + 5x + -5x Combine like terms: -9x + -5x = -14x -21 + -14x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 -21 + -14x = 21 + 0 -21 + -14x = 21 Add '21' to each side of the equation. -21 + 21 + -14x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -14x = 21 + 21 -14x = 21 + 21 Combine like terms: 21 + 21 = 42 -14x = 42 Divide each side by '-14'. x = -3 Simplifying x = -3
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