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Simplifying -90 = -5(k + -3) Reorder the terms: -90 = -5(-3 + k) -90 = (-3 * -5 + k * -5) -90 = (15 + -5k) Solving -90 = 15 + -5k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '5k' to each side of the equation. -90 + 5k = 15 + -5k + 5k Combine like terms: -5k + 5k = 0 -90 + 5k = 15 + 0 -90 + 5k = 15 Add '90' to each side of the equation. -90 + 90 + 5k = 15 + 90 Combine like terms: -90 + 90 = 0 0 + 5k = 15 + 90 5k = 15 + 90 Combine like terms: 15 + 90 = 105 5k = 105 Divide each side by '5'. k = 21 Simplifying k = 21
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