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Simplifying 15x + 18 = 3(x + 5 + 4x) Reorder the terms: 18 + 15x = 3(x + 5 + 4x) Reorder the terms: 18 + 15x = 3(5 + x + 4x) Combine like terms: x + 4x = 5x 18 + 15x = 3(5 + 5x) 18 + 15x = (5 * 3 + 5x * 3) 18 + 15x = (15 + 15x) Add '-15x' to each side of the equation. 18 + 15x + -15x = 15 + 15x + -15x Combine like terms: 15x + -15x = 0 18 + 0 = 15 + 15x + -15x 18 = 15 + 15x + -15x Combine like terms: 15x + -15x = 0 18 = 15 + 0 18 = 15 Solving 18 = 15 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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