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Simplifying 3(2x + 7) = -21 Reorder the terms: 3(7 + 2x) = -21 (7 * 3 + 2x * 3) = -21 (21 + 6x) = -21 Solving 21 + 6x = -21 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 + 6x = -21 + -21 Combine like terms: 21 + -21 = 0 0 + 6x = -21 + -21 6x = -21 + -21 Combine like terms: -21 + -21 = -42 6x = -42 Divide each side by '6'. x = -7 Simplifying x = -7
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