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Simplifying 21 = a + 13 Reorder the terms: 21 = 13 + a Solving 21 = 13 + 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 = 13 + a + -1a Combine like terms: a + -1a = 0 21 + -1a = 13 + 0 21 + -1a = 13 Add '-21' to each side of the equation. 21 + -21 + -1a = 13 + -21 Combine like terms: 21 + -21 = 0 0 + -1a = 13 + -21 -1a = 13 + -21 Combine like terms: 13 + -21 = -8 -1a = -8 Divide each side by '-1'. a = 8 Simplifying a = 8
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