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Simplifying 21 = -3(x + 2) Reorder the terms: 21 = -3(2 + x) 21 = (2 * -3 + x * -3) 21 = (-6 + -3x) Solving 21 = -6 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 21 + 3x = -6 + -3x + 3x Combine like terms: -3x + 3x = 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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