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Simplifying 7k + -7 = -21 Reorder the terms: -7 + 7k = -21 Solving -7 + 7k = -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 + 7k = -21 + 7 Combine like terms: -7 + 7 = 0 0 + 7k = -21 + 7 7k = -21 + 7 Combine like terms: -21 + 7 = -14 7k = -14 Divide each side by '7'. k = -2 Simplifying k = -2
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