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Simplifying 15a + 20 = 4a + k Reorder the terms: 20 + 15a = 4a + k Solving 20 + 15a = 4a + k Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 20 + 15a + -4a = 4a + -4a + k Combine like terms: 15a + -4a = 11a 20 + 11a = 4a + -4a + k Combine like terms: 4a + -4a = 0 20 + 11a = 0 + k 20 + 11a = k Add '-20' to each side of the equation. 20 + -20 + 11a = -20 + k Combine like terms: 20 + -20 = 0 0 + 11a = -20 + k 11a = -20 + k Divide each side by '11'. a = -1.818181818 + 0.09090909091k Simplifying a = -1.818181818 + 0.09090909091k
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