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Simplifying 7(3x + 5) + -15 = 12x + 4 + 9x Reorder the terms: 7(5 + 3x) + -15 = 12x + 4 + 9x (5 * 7 + 3x * 7) + -15 = 12x + 4 + 9x (35 + 21x) + -15 = 12x + 4 + 9x Reorder the terms: 35 + -15 + 21x = 12x + 4 + 9x Combine like terms: 35 + -15 = 20 20 + 21x = 12x + 4 + 9x Reorder the terms: 20 + 21x = 4 + 12x + 9x Combine like terms: 12x + 9x = 21x 20 + 21x = 4 + 21x Add '-21x' to each side of the equation. 20 + 21x + -21x = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 20 + 0 = 4 + 21x + -21x 20 = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 20 = 4 + 0 20 = 4 Solving 20 = 4 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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