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Simplifying 18k + -21 = 15k + 3 Reorder the terms: -21 + 18k = 15k + 3 Reorder the terms: -21 + 18k = 3 + 15k Solving -21 + 18k = 3 + 15k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-15k' to each side of the equation. -21 + 18k + -15k = 3 + 15k + -15k Combine like terms: 18k + -15k = 3k -21 + 3k = 3 + 15k + -15k Combine like terms: 15k + -15k = 0 -21 + 3k = 3 + 0 -21 + 3k = 3 Add '21' to each side of the equation. -21 + 21 + 3k = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 3k = 3 + 21 3k = 3 + 21 Combine like terms: 3 + 21 = 24 3k = 24 Divide each side by '3'. k = 8 Simplifying k = 8
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