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Simplifying 21a + -1(9a + 27) = 0 Reorder the terms: 21a + -1(27 + 9a) = 0 21a + (27 * -1 + 9a * -1) = 0 21a + (-27 + -9a) = 0 Reorder the terms: -27 + 21a + -9a = 0 Combine like terms: 21a + -9a = 12a -27 + 12a = 0 Solving -27 + 12a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 12a = 0 + 27 Combine like terms: -27 + 27 = 0 0 + 12a = 0 + 27 12a = 0 + 27 Combine like terms: 0 + 27 = 27 12a = 27 Divide each side by '12'. a = 2.25 Simplifying a = 2.25
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