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Simplifying -4(-7 + -3a) = 12a + 23 (-7 * -4 + -3a * -4) = 12a + 23 (28 + 12a) = 12a + 23 Reorder the terms: 28 + 12a = 23 + 12a Add '-12a' to each side of the equation. 28 + 12a + -12a = 23 + 12a + -12a Combine like terms: 12a + -12a = 0 28 + 0 = 23 + 12a + -12a 28 = 23 + 12a + -12a Combine like terms: 12a + -12a = 0 28 = 23 + 0 28 = 23 Solving 28 = 23 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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