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Simplifying 5a + -1((7 + 9a) + -1(3 + 4a)) = 0 Remove parenthesis around (7 + 9a) 5a + -1(7 + 9a + -1(3 + 4a)) = 0 5a + -1(7 + 9a + (3 * -1 + 4a * -1)) = 0 5a + -1(7 + 9a + (-3 + -4a)) = 0 Reorder the terms: 5a + -1(7 + -3 + 9a + -4a) = 0 Combine like terms: 7 + -3 = 4 5a + -1(4 + 9a + -4a) = 0 Combine like terms: 9a + -4a = 5a 5a + -1(4 + 5a) = 0 5a + (4 * -1 + 5a * -1) = 0 5a + (-4 + -5a) = 0 Reorder the terms: -4 + 5a + -5a = 0 Combine like terms: 5a + -5a = 0 -4 + 0 = 0 -4 = 0 Solving -4 = 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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