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Simplifying -3(2 + -1x) + 15 = -21 (2 * -3 + -1x * -3) + 15 = -21 (-6 + 3x) + 15 = -21 Reorder the terms: -6 + 15 + 3x = -21 Combine like terms: -6 + 15 = 9 9 + 3x = -21 Solving 9 + 3x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3x = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = -21 + -9 3x = -21 + -9 Combine like terms: -21 + -9 = -30 3x = -30 Divide each side by '3'. x = -10 Simplifying x = -10
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