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Simplifying 21 = 9a Solving 21 = 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 21 + -9a = 9a + -9a Combine like terms: 9a + -9a = 0 21 + -9a = 0 Add '-21' to each side of the equation. 21 + -21 + -9a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -9a = 0 + -21 -9a = 0 + -21 Combine like terms: 0 + -21 = -21 -9a = -21 Divide each side by '-9'. a = 2.333333333 Simplifying a = 2.333333333
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