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Simplifying -3k + 7 + k = 21 Reorder the terms: 7 + -3k + k = 21 Combine like terms: -3k + k = -2k 7 + -2k = 21 Solving 7 + -2k = 21 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2k = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -2k = 21 + -7 -2k = 21 + -7 Combine like terms: 21 + -7 = 14 -2k = 14 Divide each side by '-2'. k = -7 Simplifying k = -7
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