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Simplifying -10x + 12x + 21 = -6 Reorder the terms: 21 + -10x + 12x = -6 Combine like terms: -10x + 12x = 2x 21 + 2x = -6 Solving 21 + 2x = -6 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 + 2x = -6 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = -6 + -21 2x = -6 + -21 Combine like terms: -6 + -21 = -27 2x = -27 Divide each side by '2'. x = -13.5 Simplifying x = -13.5
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