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Simplifying 9(1 + -5x) = -21.5 (1 * 9 + -5x * 9) = -21.5 (9 + -45x) = -21.5 Solving 9 + -45x = -21.5 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 + -45x = -21.5 + -9 Combine like terms: 9 + -9 = 0 0 + -45x = -21.5 + -9 -45x = -21.5 + -9 Combine like terms: -21.5 + -9 = -30.5 -45x = -30.5 Divide each side by '-45'. x = 0.6777777778 Simplifying x = 0.6777777778
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