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Simplifying 5x + 21 + 3x = -9 Reorder the terms: 21 + 5x + 3x = -9 Combine like terms: 5x + 3x = 8x 21 + 8x = -9 Solving 21 + 8x = -9 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 + 8x = -9 + -21 Combine like terms: 21 + -21 = 0 0 + 8x = -9 + -21 8x = -9 + -21 Combine like terms: -9 + -21 = -30 8x = -30 Divide each side by '8'. x = -3.75 Simplifying x = -3.75
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