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Simplifying 7(a + -1) = -7 + 7a Reorder the terms: 7(-1 + a) = -7 + 7a (-1 * 7 + a * 7) = -7 + 7a (-7 + 7a) = -7 + 7a Add '7' to each side of the equation. -7 + 7 + 7a = -7 + 7 + 7a Combine like terms: -7 + 7 = 0 0 + 7a = -7 + 7 + 7a 7a = -7 + 7 + 7a Combine like terms: -7 + 7 = 0 7a = 0 + 7a 7a = 7a Add '-7a' to each side of the equation. 7a + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 0 = 7a + -7a Combine like terms: 7a + -7a = 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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