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Simplifying 12x + 21 = 9x + -15 Reorder the terms: 21 + 12x = 9x + -15 Reorder the terms: 21 + 12x = -15 + 9x Solving 21 + 12x = -15 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 21 + 12x + -9x = -15 + 9x + -9x Combine like terms: 12x + -9x = 3x 21 + 3x = -15 + 9x + -9x Combine like terms: 9x + -9x = 0 21 + 3x = -15 + 0 21 + 3x = -15 Add '-21' to each side of the equation. 21 + -21 + 3x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -15 + -21 3x = -15 + -21 Combine like terms: -15 + -21 = -36 3x = -36 Divide each side by '3'. x = -12 Simplifying x = -12
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