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Simplifying 3(5x + 7) = 15x + 7 Reorder the terms: 3(7 + 5x) = 15x + 7 (7 * 3 + 5x * 3) = 15x + 7 (21 + 15x) = 15x + 7 Reorder the terms: 21 + 15x = 7 + 15x Add '-15x' to each side of the equation. 21 + 15x + -15x = 7 + 15x + -15x Combine like terms: 15x + -15x = 0 21 + 0 = 7 + 15x + -15x 21 = 7 + 15x + -15x Combine like terms: 15x + -15x = 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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