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Simplifying 21 = -9(-5 + -3x) 21 = (-5 * -9 + -3x * -9) 21 = (45 + 27x) Solving 21 = 45 + 27x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27x' to each side of the equation. 21 + -27x = 45 + 27x + -27x Combine like terms: 27x + -27x = 0 21 + -27x = 45 + 0 21 + -27x = 45 Add '-21' to each side of the equation. 21 + -21 + -27x = 45 + -21 Combine like terms: 21 + -21 = 0 0 + -27x = 45 + -21 -27x = 45 + -21 Combine like terms: 45 + -21 = 24 -27x = 24 Divide each side by '-27'. x = -0.8888888889 Simplifying x = -0.8888888889
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