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Simplifying -45 = -3(-3a + 3) Reorder the terms: -45 = -3(3 + -3a) -45 = (3 * -3 + -3a * -3) -45 = (-9 + 9a) Solving -45 = -9 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -45 + -9a = -9 + 9a + -9a Combine like terms: 9a + -9a = 0 -45 + -9a = -9 + 0 -45 + -9a = -9 Add '45' to each side of the equation. -45 + 45 + -9a = -9 + 45 Combine like terms: -45 + 45 = 0 0 + -9a = -9 + 45 -9a = -9 + 45 Combine like terms: -9 + 45 = 36 -9a = 36 Divide each side by '-9'. a = -4 Simplifying a = -4
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