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Simplifying 20 = (-11) + -13k + -18k 20 = -11 + -13k + -18k Combine like terms: -13k + -18k = -31k 20 = -11 + -31k Solving 20 = -11 + -31k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '31k' to each side of the equation. 20 + 31k = -11 + -31k + 31k Combine like terms: -31k + 31k = 0 20 + 31k = -11 + 0 20 + 31k = -11 Add '-20' to each side of the equation. 20 + -20 + 31k = -11 + -20 Combine like terms: 20 + -20 = 0 0 + 31k = -11 + -20 31k = -11 + -20 Combine like terms: -11 + -20 = -31 31k = -31 Divide each side by '31'. k = -1 Simplifying k = -1
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