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Simplifying 3(a + -7) = -9 + 3a Reorder the terms: 3(-7 + a) = -9 + 3a (-7 * 3 + a * 3) = -9 + 3a (-21 + 3a) = -9 + 3a Add '-3a' to each side of the equation. -21 + 3a + -3a = -9 + 3a + -3a Combine like terms: 3a + -3a = 0 -21 + 0 = -9 + 3a + -3a -21 = -9 + 3a + -3a Combine like terms: 3a + -3a = 0 -21 = -9 + 0 -21 = -9 Solving -21 = -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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