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Simplifying -5a + 7 + 4a = -1(a + 7) Reorder the terms: 7 + -5a + 4a = -1(a + 7) Combine like terms: -5a + 4a = -1a 7 + -1a = -1(a + 7) Reorder the terms: 7 + -1a = -1(7 + a) 7 + -1a = (7 * -1 + a * -1) 7 + -1a = (-7 + -1a) Add 'a' to each side of the equation. 7 + -1a + a = -7 + -1a + a Combine like terms: -1a + a = 0 7 + 0 = -7 + -1a + a 7 = -7 + -1a + a Combine like terms: -1a + a = 0 7 = -7 + 0 7 = -7 Solving 7 = -7 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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