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Simplifying -20 = -1(2 + k) -20 = (2 * -1 + k * -1) -20 = (-2 + -1k) Solving -20 = -2 + -1k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add 'k' to each side of the equation. -20 + k = -2 + -1k + k Combine like terms: -1k + k = 0 -20 + k = -2 + 0 -20 + k = -2 Add '20' to each side of the equation. -20 + 20 + k = -2 + 20 Combine like terms: -20 + 20 = 0 0 + k = -2 + 20 k = -2 + 20 Combine like terms: -2 + 20 = 18 k = 18 Simplifying k = 18
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