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Simplifying -3(3x + -1) = -21 Reorder the terms: -3(-1 + 3x) = -21 (-1 * -3 + 3x * -3) = -21 (3 + -9x) = -21 Solving 3 + -9x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -9x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + -9x = -21 + -3 -9x = -21 + -3 Combine like terms: -21 + -3 = -24 -9x = -24 Divide each side by '-9'. x = 2.666666667 Simplifying x = 2.666666667
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