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Simplifying a + 2(a + -7) = 3a + 9 Reorder the terms: a + 2(-7 + a) = 3a + 9 a + (-7 * 2 + a * 2) = 3a + 9 a + (-14 + 2a) = 3a + 9 Reorder the terms: -14 + a + 2a = 3a + 9 Combine like terms: a + 2a = 3a -14 + 3a = 3a + 9 Reorder the terms: -14 + 3a = 9 + 3a Add '-3a' to each side of the equation. -14 + 3a + -3a = 9 + 3a + -3a Combine like terms: 3a + -3a = 0 -14 + 0 = 9 + 3a + -3a -14 = 9 + 3a + -3a Combine like terms: 3a + -3a = 0 -14 = 9 + 0 -14 = 9 Solving -14 = 9 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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