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Simplifying -7(a + 2) + 15 = 1 + -7a Reorder the terms: -7(2 + a) + 15 = 1 + -7a (2 * -7 + a * -7) + 15 = 1 + -7a (-14 + -7a) + 15 = 1 + -7a Reorder the terms: -14 + 15 + -7a = 1 + -7a Combine like terms: -14 + 15 = 1 1 + -7a = 1 + -7a Add '-1' to each side of the equation. 1 + -1 + -7a = 1 + -1 + -7a Combine like terms: 1 + -1 = 0 0 + -7a = 1 + -1 + -7a -7a = 1 + -1 + -7a Combine like terms: 1 + -1 = 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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