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Simplifying -3(7x + 1) = -129 Reorder the terms: -3(1 + 7x) = -129 (1 * -3 + 7x * -3) = -129 (-3 + -21x) = -129 Solving -3 + -21x = -129 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 = -129 + 3 Combine like terms: -3 + 3 = 0 0 + -21x = -129 + 3 -21x = -129 + 3 Combine like terms: -129 + 3 = -126 -21x = -126 Divide each side by '-21'. x = 6 Simplifying x = 6
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