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Simplifying 84 = 4(s + 7) Reorder the terms: 84 = 4(7 + s) 84 = (7 * 4 + s * 4) 84 = (28 + 4s) Solving 84 = 28 + 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. 84 + -4s = 28 + 4s + -4s Combine like terms: 4s + -4s = 0 84 + -4s = 28 + 0 84 + -4s = 28 Add '-84' to each side of the equation. 84 + -84 + -4s = 28 + -84 Combine like terms: 84 + -84 = 0 0 + -4s = 28 + -84 -4s = 28 + -84 Combine like terms: 28 + -84 = -56 -4s = -56 Divide each side by '-4'. s = 14 Simplifying s = 14
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