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Simplifying 3(4x + 3) = 7x + 5x + 21 Reorder the terms: 3(3 + 4x) = 7x + 5x + 21 (3 * 3 + 4x * 3) = 7x + 5x + 21 (9 + 12x) = 7x + 5x + 21 Reorder the terms: 9 + 12x = 21 + 7x + 5x Combine like terms: 7x + 5x = 12x 9 + 12x = 21 + 12x Add '-12x' to each side of the equation. 9 + 12x + -12x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 9 + 0 = 21 + 12x + -12x 9 = 21 + 12x + -12x Combine like terms: 12x + -12x = 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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