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Simplifying 20k + 4 + 13k + -13 = 90 Reorder the terms: 4 + -13 + 20k + 13k = 90 Combine like terms: 4 + -13 = -9 -9 + 20k + 13k = 90 Combine like terms: 20k + 13k = 33k -9 + 33k = 90 Solving -9 + 33k = 90 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 33k = 90 + 9 Combine like terms: -9 + 9 = 0 0 + 33k = 90 + 9 33k = 90 + 9 Combine like terms: 90 + 9 = 99 33k = 99 Divide each side by '33'. k = 3 Simplifying k = 3
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