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Simplifying 21 = a + 15 Reorder the terms: 21 = 15 + a Solving 21 = 15 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 21 + -1a = 15 + a + -1a Combine like terms: a + -1a = 0 21 + -1a = 15 + 0 21 + -1a = 15 Add '-21' to each side of the equation. 21 + -21 + -1a = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 15 + -21 -1a = 15 + -21 Combine like terms: 15 + -21 = -6 -1a = -6 Divide each side by '-1'. a = 6 Simplifying a = 6
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