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Simplifying 21 + -9x = -6 + -12x Solving 21 + -9x = -6 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 21 + -9x + 12x = -6 + -12x + 12x Combine like terms: -9x + 12x = 3x 21 + 3x = -6 + -12x + 12x Combine like terms: -12x + 12x = 0 21 + 3x = -6 + 0 21 + 3x = -6 Add '-21' to each side of the equation. 21 + -21 + 3x = -6 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -6 + -21 3x = -6 + -21 Combine like terms: -6 + -21 = -27 3x = -27 Divide each side by '3'. x = -9 Simplifying x = -9
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