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