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Simplifying -6k + 21 + -15k = 210 Reorder the terms: 21 + -6k + -15k = 210 Combine like terms: -6k + -15k = -21k 21 + -21k = 210 Solving 21 + -21k = 210 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -21k = 210 + -21 Combine like terms: 21 + -21 = 0 0 + -21k = 210 + -21 -21k = 210 + -21 Combine like terms: 210 + -21 = 189 -21k = 189 Divide each side by '-21'. k = -9 Simplifying k = -9
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