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Simplifying 7(3x + 4) = 91 Reorder the terms: 7(4 + 3x) = 91 (4 * 7 + 3x * 7) = 91 (28 + 21x) = 91 Solving 28 + 21x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 21x = 91 + -28 Combine like terms: 28 + -28 = 0 0 + 21x = 91 + -28 21x = 91 + -28 Combine like terms: 91 + -28 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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