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Simplifying 21(6a + 15) = 6993 Reorder the terms: 21(15 + 6a) = 6993 (15 * 21 + 6a * 21) = 6993 (315 + 126a) = 6993 Solving 315 + 126a = 6993 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-315' to each side of the equation. 315 + -315 + 126a = 6993 + -315 Combine like terms: 315 + -315 = 0 0 + 126a = 6993 + -315 126a = 6993 + -315 Combine like terms: 6993 + -315 = 6678 126a = 6678 Divide each side by '126'. a = 53 Simplifying a = 53
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