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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 '7' to each side of the equation. -7 + 7 + -1a = -7 + 7 + -1a Combine like terms: -7 + 7 = 0 0 + -1a = -7 + 7 + -1a -1a = -7 + 7 + -1a Combine like terms: -7 + 7 = 0 -1a = 0 + -1a -1a = -1a Add 'a' to each side of the equation. -1a + a = -1a + a Combine like terms: -1a + a = 0 0 = -1a + a Combine like terms: -1a + a = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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