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