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Simplifying k + 20 + -4k = -90 Reorder the terms: 20 + k + -4k = -90 Combine like terms: k + -4k = -3k 20 + -3k = -90 Solving 20 + -3k = -90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -3k = -90 + -20 Combine like terms: 20 + -20 = 0 0 + -3k = -90 + -20 -3k = -90 + -20 Combine like terms: -90 + -20 = -110 -3k = -110 Divide each side by '-3'. k = 36.66666667 Simplifying k = 36.66666667
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