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Simplifying 7(3x + 4) + -1 = -78 Reorder the terms: 7(4 + 3x) + -1 = -78 (4 * 7 + 3x * 7) + -1 = -78 (28 + 21x) + -1 = -78 Reorder the terms: 28 + -1 + 21x = -78 Combine like terms: 28 + -1 = 27 27 + 21x = -78 Solving 27 + 21x = -78 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 21x = -78 + -27 Combine like terms: 27 + -27 = 0 0 + 21x = -78 + -27 21x = -78 + -27 Combine like terms: -78 + -27 = -105 21x = -105 Divide each side by '21'. x = -5 Simplifying x = -5
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