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Simplifying 1 + -3k + 7 = -13 Reorder the terms: 1 + 7 + -3k = -13 Combine like terms: 1 + 7 = 8 8 + -3k = -13 Solving 8 + -3k = -13 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3k = -13 + -8 Combine like terms: 8 + -8 = 0 0 + -3k = -13 + -8 -3k = -13 + -8 Combine like terms: -13 + -8 = -21 -3k = -21 Divide each side by '-3'. k = 7 Simplifying k = 7
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