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Simplifying 7a + -4 = (3a + 9) + 4a Reorder the terms: -4 + 7a = (3a + 9) + 4a Reorder the terms: -4 + 7a = (9 + 3a) + 4a Remove parenthesis around (9 + 3a) -4 + 7a = 9 + 3a + 4a Combine like terms: 3a + 4a = 7a -4 + 7a = 9 + 7a Add '-7a' to each side of the equation. -4 + 7a + -7a = 9 + 7a + -7a Combine like terms: 7a + -7a = 0 -4 + 0 = 9 + 7a + -7a -4 = 9 + 7a + -7a Combine like terms: 7a + -7a = 0 -4 = 9 + 0 -4 = 9 Solving -4 = 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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