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Simplifying 7a + -4 = 3(a + 9) + 4a Reorder the terms: -4 + 7a = 3(a + 9) + 4a Reorder the terms: -4 + 7a = 3(9 + a) + 4a -4 + 7a = (9 * 3 + a * 3) + 4a -4 + 7a = (27 + 3a) + 4a Combine like terms: 3a + 4a = 7a -4 + 7a = 27 + 7a Add '-7a' to each side of the equation. -4 + 7a + -7a = 27 + 7a + -7a Combine like terms: 7a + -7a = 0 -4 + 0 = 27 + 7a + -7a -4 = 27 + 7a + -7a Combine like terms: 7a + -7a = 0 -4 = 27 + 0 -4 = 27 Solving -4 = 27 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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