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Simplifying s * 7 + 21 = 161 Reorder the terms for easier multiplication: 7s + 21 = 161 Reorder the terms: 21 + 7s = 161 Solving 21 + 7s = 161 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 7s = 161 + -21 Combine like terms: 21 + -21 = 0 0 + 7s = 161 + -21 7s = 161 + -21 Combine like terms: 161 + -21 = 140 7s = 140 Divide each side by '7'. s = 20 Simplifying s = 20
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