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Simplifying -1 + 7(3x + 1) = -120 Reorder the terms: -1 + 7(1 + 3x) = -120 -1 + (1 * 7 + 3x * 7) = -120 -1 + (7 + 21x) = -120 Combine like terms: -1 + 7 = 6 6 + 21x = -120 Solving 6 + 21x = -120 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 21x = -120 + -6 Combine like terms: 6 + -6 = 0 0 + 21x = -120 + -6 21x = -120 + -6 Combine like terms: -120 + -6 = -126 21x = -126 Divide each side by '21'. x = -6 Simplifying x = -6
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