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Simplifying 9(a + -3) = 2a + 1 Reorder the terms: 9(-3 + a) = 2a + 1 (-3 * 9 + a * 9) = 2a + 1 (-27 + 9a) = 2a + 1 Reorder the terms: -27 + 9a = 1 + 2a Solving -27 + 9a = 1 + 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. -27 + 9a + -2a = 1 + 2a + -2a Combine like terms: 9a + -2a = 7a -27 + 7a = 1 + 2a + -2a Combine like terms: 2a + -2a = 0 -27 + 7a = 1 + 0 -27 + 7a = 1 Add '27' to each side of the equation. -27 + 27 + 7a = 1 + 27 Combine like terms: -27 + 27 = 0 0 + 7a = 1 + 27 7a = 1 + 27 Combine like terms: 1 + 27 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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