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Simplifying 21 = 5 + 4(s + -5) Reorder the terms: 21 = 5 + 4(-5 + s) 21 = 5 + (-5 * 4 + s * 4) 21 = 5 + (-20 + 4s) Combine like terms: 5 + -20 = -15 21 = -15 + 4s Solving 21 = -15 + 4s Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4s' to each side of the equation. 21 + -4s = -15 + 4s + -4s Combine like terms: 4s + -4s = 0 21 + -4s = -15 + 0 21 + -4s = -15 Add '-21' to each side of the equation. 21 + -21 + -4s = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -4s = -15 + -21 -4s = -15 + -21 Combine like terms: -15 + -21 = -36 -4s = -36 Divide each side by '-4'. s = 9 Simplifying s = 9
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