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Simplifying 2a + -1[3a + -1(a + -5)] + -7 = 0 Reorder the terms: 2a + -1[3a + -1(-5 + a)] + -7 = 0 2a + -1[3a + (-5 * -1 + a * -1)] + -7 = 0 2a + -1[3a + (5 + -1a)] + -7 = 0 Reorder the terms: 2a + -1[5 + 3a + -1a] + -7 = 0 Combine like terms: 3a + -1a = 2a 2a + -1[5 + 2a] + -7 = 0 2a + [5 * -1 + 2a * -1] + -7 = 0 2a + [-5 + -2a] + -7 = 0 Reorder the terms: -5 + -7 + 2a + -2a = 0 Combine like terms: -5 + -7 = -12 -12 + 2a + -2a = 0 Combine like terms: 2a + -2a = 0 -12 + 0 = 0 -12 = 0 Solving -12 = 0 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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