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Simplifying -3(-7x + 1) = 123 Reorder the terms: -3(1 + -7x) = 123 (1 * -3 + -7x * -3) = 123 (-3 + 21x) = 123 Solving -3 + 21x = 123 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 = 123 + 3 Combine like terms: -3 + 3 = 0 0 + 21x = 123 + 3 21x = 123 + 3 Combine like terms: 123 + 3 = 126 21x = 126 Divide each side by '21'. x = 6 Simplifying x = 6
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