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Simplifying 7(3s + 7) = 91 Reorder the terms: 7(7 + 3s) = 91 (7 * 7 + 3s * 7) = 91 (49 + 21s) = 91 Solving 49 + 21s = 91 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 21s = 91 + -49 Combine like terms: 49 + -49 = 0 0 + 21s = 91 + -49 21s = 91 + -49 Combine like terms: 91 + -49 = 42 21s = 42 Divide each side by '21'. s = 2 Simplifying s = 2
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