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Simplifying 9 + 12 = 2a Combine like terms: 9 + 12 = 21 21 = 2a Solving 21 = 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 21 + -2a = 2a + -2a Combine like terms: 2a + -2a = 0 21 + -2a = 0 Add '-21' to each side of the equation. 21 + -21 + -2a = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -2a = 0 + -21 -2a = 0 + -21 Combine like terms: 0 + -21 = -21 -2a = -21 Divide each side by '-2'. a = 10.5 Simplifying a = 10.5
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