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Simplifying -3(x + 9) = x + -21 Reorder the terms: -3(9 + x) = x + -21 (9 * -3 + x * -3) = x + -21 (-27 + -3x) = x + -21 Reorder the terms: -27 + -3x = -21 + x Solving -27 + -3x = -21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -27 + -3x + -1x = -21 + x + -1x Combine like terms: -3x + -1x = -4x -27 + -4x = -21 + x + -1x Combine like terms: x + -1x = 0 -27 + -4x = -21 + 0 -27 + -4x = -21 Add '27' to each side of the equation. -27 + 27 + -4x = -21 + 27 Combine like terms: -27 + 27 = 0 0 + -4x = -21 + 27 -4x = -21 + 27 Combine like terms: -21 + 27 = 6 -4x = 6 Divide each side by '-4'. x = -1.5 Simplifying x = -1.5
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