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Simplifying -3x + -21 = -9x + 9 Reorder the terms: -21 + -3x = -9x + 9 Reorder the terms: -21 + -3x = 9 + -9x Solving -21 + -3x = 9 + -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. -21 + -3x + 9x = 9 + -9x + 9x Combine like terms: -3x + 9x = 6x -21 + 6x = 9 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 6x = 9 + 0 -21 + 6x = 9 Add '21' to each side of the equation. -21 + 21 + 6x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 6x = 9 + 21 6x = 9 + 21 Combine like terms: 9 + 21 = 30 6x = 30 Divide each side by '6'. x = 5 Simplifying x = 5
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