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Simplifying -3(-7x + -15) = 15 Reorder the terms: -3(-15 + -7x) = 15 (-15 * -3 + -7x * -3) = 15 (45 + 21x) = 15 Solving 45 + 21x = 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 + 21x = 15 + -45 Combine like terms: 45 + -45 = 0 0 + 21x = 15 + -45 21x = 15 + -45 Combine like terms: 15 + -45 = -30 21x = -30 Divide each side by '21'. x = -1.428571429 Simplifying x = -1.428571429
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