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Simplifying 9 + -1(a + -3) + 4a = 4a + -1(a + 2) + -6 Reorder the terms: 9 + -1(-3 + a) + 4a = 4a + -1(a + 2) + -6 9 + (-3 * -1 + a * -1) + 4a = 4a + -1(a + 2) + -6 9 + (3 + -1a) + 4a = 4a + -1(a + 2) + -6 Combine like terms: 9 + 3 = 12 12 + -1a + 4a = 4a + -1(a + 2) + -6 Combine like terms: -1a + 4a = 3a 12 + 3a = 4a + -1(a + 2) + -6 Reorder the terms: 12 + 3a = 4a + -1(2 + a) + -6 12 + 3a = 4a + (2 * -1 + a * -1) + -6 12 + 3a = 4a + (-2 + -1a) + -6 Reorder the terms: 12 + 3a = -2 + -6 + 4a + -1a Combine like terms: -2 + -6 = -8 12 + 3a = -8 + 4a + -1a Combine like terms: 4a + -1a = 3a 12 + 3a = -8 + 3a Add '-3a' to each side of the equation. 12 + 3a + -3a = -8 + 3a + -3a Combine like terms: 3a + -3a = 0 12 + 0 = -8 + 3a + -3a 12 = -8 + 3a + -3a Combine like terms: 3a + -3a = 0 12 = -8 + 0 12 = -8 Solving 12 = -8 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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