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Simplifying 87 + 3(s + 7) + -21 = 36 Reorder the terms: 87 + 3(7 + s) + -21 = 36 87 + (7 * 3 + s * 3) + -21 = 36 87 + (21 + 3s) + -21 = 36 Reorder the terms: 87 + 21 + -21 + 3s = 36 Combine like terms: 87 + 21 = 108 108 + -21 + 3s = 36 Combine like terms: 108 + -21 = 87 87 + 3s = 36 Solving 87 + 3s = 36 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-87' to each side of the equation. 87 + -87 + 3s = 36 + -87 Combine like terms: 87 + -87 = 0 0 + 3s = 36 + -87 3s = 36 + -87 Combine like terms: 36 + -87 = -51 3s = -51 Divide each side by '3'. s = -17 Simplifying s = -17
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