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Simplifying -87 = -7 + 10k Solving -87 = -7 + 10k Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-10k' to each side of the equation. -87 + -10k = -7 + 10k + -10k Combine like terms: 10k + -10k = 0 -87 + -10k = -7 + 0 -87 + -10k = -7 Add '87' to each side of the equation. -87 + 87 + -10k = -7 + 87 Combine like terms: -87 + 87 = 0 0 + -10k = -7 + 87 -10k = -7 + 87 Combine like terms: -7 + 87 = 80 -10k = 80 Divide each side by '-10'. k = -8 Simplifying k = -8
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