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Simplifying -21 + -4x = 9 + -9x Solving -21 + -4x = 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 + -4x + 9x = 9 + -9x + 9x Combine like terms: -4x + 9x = 5x -21 + 5x = 9 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + 5x = 9 + 0 -21 + 5x = 9 Add '21' to each side of the equation. -21 + 21 + 5x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 5x = 9 + 21 5x = 9 + 21 Combine like terms: 9 + 21 = 30 5x = 30 Divide each side by '5'. x = 6 Simplifying x = 6
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