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Simplifying -21 = 9x + -15 + -3x Reorder the terms: -21 = -15 + 9x + -3x Combine like terms: 9x + -3x = 6x -21 = -15 + 6x Solving -21 = -15 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -21 + -6x = -15 + 6x + -6x Combine like terms: 6x + -6x = 0 -21 + -6x = -15 + 0 -21 + -6x = -15 Add '21' to each side of the equation. -21 + 21 + -6x = -15 + 21 Combine like terms: -21 + 21 = 0 0 + -6x = -15 + 21 -6x = -15 + 21 Combine like terms: -15 + 21 = 6 -6x = 6 Divide each side by '-6'. x = -1 Simplifying x = -1
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