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Simplifying (a + -6)(a + -7) = x Reorder the terms: (-6 + a)(a + -7) = x Reorder the terms: (-6 + a)(-7 + a) = x Multiply (-6 + a) * (-7 + a) (-6(-7 + a) + a(-7 + a)) = x ((-7 * -6 + a * -6) + a(-7 + a)) = x ((42 + -6a) + a(-7 + a)) = x (42 + -6a + (-7 * a + a * a)) = x (42 + -6a + (-7a + a2)) = x Combine like terms: -6a + -7a = -13a (42 + -13a + a2) = x Solving 42 + -13a + a2 = x Solving for variable 'a'. Combine like terms: x + -1x = 0 42 + -13a + a2 + -1x = 0 The solution to this equation could not be determined.
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