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Simplifying -3(-7x + -1) = 45 Reorder the terms: -3(-1 + -7x) = 45 (-1 * -3 + -7x * -3) = 45 (3 + 21x) = 45 Solving 3 + 21x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 21x = 45 + -3 Combine like terms: 3 + -3 = 0 0 + 21x = 45 + -3 21x = 45 + -3 Combine like terms: 45 + -3 = 42 21x = 42 Divide each side by '21'. x = 2 Simplifying x = 2
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