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Simplifying 9a + -3(3 + 2a) + 3 = 54 9a + (3 * -3 + 2a * -3) + 3 = 54 9a + (-9 + -6a) + 3 = 54 Reorder the terms: -9 + 3 + 9a + -6a = 54 Combine like terms: -9 + 3 = -6 -6 + 9a + -6a = 54 Combine like terms: 9a + -6a = 3a -6 + 3a = 54 Solving -6 + 3a = 54 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3a = 54 + 6 Combine like terms: -6 + 6 = 0 0 + 3a = 54 + 6 3a = 54 + 6 Combine like terms: 54 + 6 = 60 3a = 60 Divide each side by '3'. a = 20 Simplifying a = 20
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