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Simplifying 7a + 9 + -2(3a) = 21 Remove parenthesis around (3a) 7a + 9 + -2 * 3a = 21 Multiply -2 * 3 7a + 9 + -6a = 21 Reorder the terms: 9 + 7a + -6a = 21 Combine like terms: 7a + -6a = 1a 9 + 1a = 21 Solving 9 + 1a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. 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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