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Simplifying 7k + -15 = 55 + -3k Reorder the terms: -15 + 7k = 55 + -3k Solving -15 + 7k = 55 + -3k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '3k' to each side of the equation. -15 + 7k + 3k = 55 + -3k + 3k Combine like terms: 7k + 3k = 10k -15 + 10k = 55 + -3k + 3k Combine like terms: -3k + 3k = 0 -15 + 10k = 55 + 0 -15 + 10k = 55 Add '15' to each side of the equation. -15 + 15 + 10k = 55 + 15 Combine like terms: -15 + 15 = 0 0 + 10k = 55 + 15 10k = 55 + 15 Combine like terms: 55 + 15 = 70 10k = 70 Divide each side by '10'. k = 7 Simplifying k = 7
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