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Simplifying -135 = -5(3a + 3) Reorder the terms: -135 = -5(3 + 3a) -135 = (3 * -5 + 3a * -5) -135 = (-15 + -15a) Solving -135 = -15 + -15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15a' to each side of the equation. -135 + 15a = -15 + -15a + 15a Combine like terms: -15a + 15a = 0 -135 + 15a = -15 + 0 -135 + 15a = -15 Add '135' to each side of the equation. -135 + 135 + 15a = -15 + 135 Combine like terms: -135 + 135 = 0 0 + 15a = -15 + 135 15a = -15 + 135 Combine like terms: -15 + 135 = 120 15a = 120 Divide each side by '15'. a = 8 Simplifying a = 8
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