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Simplifying -3(3a + 3) = -45 Reorder the terms: -3(3 + 3a) = -45 (3 * -3 + 3a * -3) = -45 (-9 + -9a) = -45 Solving -9 + -9a = -45 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 + -9a = -45 + 9 Combine like terms: -9 + 9 = 0 0 + -9a = -45 + 9 -9a = -45 + 9 Combine like terms: -45 + 9 = -36 -9a = -36 Divide each side by '-9'. a = 4 Simplifying a = 4
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