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Simplifying 3(21 + -1k) + -1k = 21 (21 * 3 + -1k * 3) + -1k = 21 (63 + -3k) + -1k = 21 Combine like terms: -3k + -1k = -4k 63 + -4k = 21 Solving 63 + -4k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -4k = 21 + -63 Combine like terms: 63 + -63 = 0 0 + -4k = 21 + -63 -4k = 21 + -63 Combine like terms: 21 + -63 = -42 -4k = -42 Divide each side by '-4'. k = 10.5 Simplifying k = 10.5
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