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Simplifying (A + 7)(a + -1) = 20 Reorder the terms: (7 + A)(a + -1) = 20 Reorder the terms: (7 + A)(-1 + a) = 20 Multiply (7 + A) * (-1 + a) (7(-1 + a) + A(-1 + a)) = 20 ((-1 * 7 + a * 7) + A(-1 + a)) = 20 ((-7 + 7a) + A(-1 + a)) = 20 (-7 + 7a + (-1 * A + a * A)) = 20 (-7 + 7a + (-1A + aA)) = 20 Reorder the terms: (-7 + -1A + 7a + aA) = 20 (-7 + -1A + 7a + aA) = 20 Solving -7 + -1A + 7a + aA = 20 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '7' to each side of the equation. -7 + -1A + 7a + 7 + aA = 20 + 7 Reorder the terms: -7 + 7 + -1A + 7a + aA = 20 + 7 Combine like terms: -7 + 7 = 0 0 + -1A + 7a + aA = 20 + 7 -1A + 7a + aA = 20 + 7 Combine like terms: 20 + 7 = 27 -1A + 7a + aA = 27 Add '-7a' to each side of the equation. -1A + 7a + -7a + aA = 27 + -7a Combine like terms: 7a + -7a = 0 -1A + 0 + aA = 27 + -7a -1A + aA = 27 + -7a Reorder the terms: -27 + -1A + 7a + aA = 27 + -7a + -27 + 7a Reorder the terms: -27 + -1A + 7a + aA = 27 + -27 + -7a + 7a Combine like terms: 27 + -27 = 0 -27 + -1A + 7a + aA = 0 + -7a + 7a -27 + -1A + 7a + aA = -7a + 7a Combine like terms: -7a + 7a = 0 -27 + -1A + 7a + aA = 0 The solution to this equation could not be determined.
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