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Simplifying 0 = a(0 + -90) Combine like terms: 0 + -90 = -90 0 = a(-90) Reorder the terms for easier multiplication: 0 = -90a Solving 0 = -90a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '90a' to each side of the equation. 0 + 90a = -90a + 90a Remove the zero: 90a = -90a + 90a Combine like terms: -90a + 90a = 0 90a = 0 Divide each side by '90'. a = 0 Simplifying a = 0
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