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Simplifying -3(x + -3) = -21 Reorder the terms: -3(-3 + x) = -21 (-3 * -3 + x * -3) = -21 (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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