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Simplifying -21 = 3(2x + 3) Reorder the terms: -21 = 3(3 + 2x) -21 = (3 * 3 + 2x * 3) -21 = (9 + 6x) Solving -21 = 9 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. -21 + -6x = 9 + 6x + -6x Combine like terms: 6x + -6x = 0 -21 + -6x = 9 + 0 -21 + -6x = 9 Add '21' to each side of the equation. -21 + 21 + -6x = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -6x = 9 + 21 -6x = 9 + 21 Combine like terms: 9 + 21 = 30 -6x = 30 Divide each side by '-6'. x = -5 Simplifying x = -5
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