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Simplifying 12x + -5x + 21 = -28 Reorder the terms: 21 + 12x + -5x = -28 Combine like terms: 12x + -5x = 7x 21 + 7x = -28 Solving 21 + 7x = -28 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 + 7x = -28 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = -28 + -21 7x = -28 + -21 Combine like terms: -28 + -21 = -49 7x = -49 Divide each side by '7'. x = -7 Simplifying x = -7
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