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Simplifying 9 = a + 21 Reorder the terms: 9 = 21 + a Solving 9 = 21 + 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. 9 + -1a = 21 + a + -1a Combine like terms: a + -1a = 0 9 + -1a = 21 + 0 9 + -1a = 21 Add '-9' to each side of the equation. 9 + -9 + -1a = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -1a = 21 + -9 -1a = 21 + -9 Combine like terms: 21 + -9 = 12 -1a = 12 Divide each side by '-1'. a = -12 Simplifying a = -12
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