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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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