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