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Simplifying 6x + 3x + 21 = -15 Reorder the terms: 21 + 6x + 3x = -15 Combine like terms: 6x + 3x = 9x 21 + 9x = -15 Solving 21 + 9x = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 9x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = -15 + -21 9x = -15 + -21 Combine like terms: -15 + -21 = -36 9x = -36 Divide each side by '9'. x = -4 Simplifying x = -4
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