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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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