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Simplifying 4 = a(7 + -5)(7 + -9) Combine like terms: 7 + -5 = 2 4 = a(2)(7 + -9) Combine like terms: 7 + -9 = -2 4 = a * 2(-2) Reorder the terms for easier multiplication: 4 = 2 * -2a Multiply 2 * -2 4 = -4a Solving 4 = -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 4 + 4a = -4a + 4a Combine like terms: -4a + 4a = 0 4 + 4a = 0 Add '-4' to each side of the equation. 4 + -4 + 4a = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 4a = 0 + -4 4a = 0 + -4 Combine like terms: 0 + -4 = -4 4a = -4 Divide each side by '4'. a = -1 Simplifying a = -1
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