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Simplifying -7k + r = a + -87 Reorder the terms: -7k + r = -87 + a Solving -7k + r = -87 + a Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-1r' to each side of the equation. -7k + r + -1r = -87 + a + -1r Combine like terms: r + -1r = 0 -7k + 0 = -87 + a + -1r -7k = -87 + a + -1r Divide each side by '-7'. k = 12.42857143 + -0.1428571429a + 0.1428571429r Simplifying k = 12.42857143 + -0.1428571429a + 0.1428571429r
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