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Simplifying -5(-9 + 4x) = -15 (-9 * -5 + 4x * -5) = -15 (45 + -20x) = -15 Solving 45 + -20x = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + -20x = -15 + -45 Combine like terms: 45 + -45 = 0 0 + -20x = -15 + -45 -20x = -15 + -45 Combine like terms: -15 + -45 = -60 -20x = -60 Divide each side by '-20'. x = 3 Simplifying x = 3
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