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Simplifying 15 + -1(a + -4) = 13 + -1a Reorder the terms: 15 + -1(-4 + a) = 13 + -1a 15 + (-4 * -1 + a * -1) = 13 + -1a 15 + (4 + -1a) = 13 + -1a Combine like terms: 15 + 4 = 19 19 + -1a = 13 + -1a Add 'a' to each side of the equation. 19 + -1a + a = 13 + -1a + a Combine like terms: -1a + a = 0 19 + 0 = 13 + -1a + a 19 = 13 + -1a + a Combine like terms: -1a + a = 0 19 = 13 + 0 19 = 13 Solving 19 = 13 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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