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Simplifying 21 = 7S Solving 21 = 7S Solving for variable 'S'. Move all terms containing S to the left, all other terms to the right. Add '-7S' to each side of the equation. 21 + -7S = 7S + -7S Combine like terms: 7S + -7S = 0 21 + -7S = 0 Add '-21' to each side of the equation. 21 + -21 + -7S = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7S = 0 + -21 -7S = 0 + -21 Combine like terms: 0 + -21 = -21 -7S = -21 Divide each side by '-7'. S = 3 Simplifying S = 3
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