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Simplifying 7(a + -1) = 6a + 12 + a Reorder the terms: 7(-1 + a) = 6a + 12 + a (-1 * 7 + a * 7) = 6a + 12 + a (-7 + 7a) = 6a + 12 + a Reorder the terms: -7 + 7a = 12 + 6a + a Combine like terms: 6a + a = 7a -7 + 7a = 12 + 7a Add '-7a' to each side of the equation. -7 + 7a + -7a = 12 + 7a + -7a Combine like terms: 7a + -7a = 0 -7 + 0 = 12 + 7a + -7a -7 = 12 + 7a + -7a Combine like terms: 7a + -7a = 0 -7 = 12 + 0 -7 = 12 Solving -7 = 12 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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