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Simplifying 5(4 + x) + 2x = 15 + 7x (4 * 5 + x * 5) + 2x = 15 + 7x (20 + 5x) + 2x = 15 + 7x Combine like terms: 5x + 2x = 7x 20 + 7x = 15 + 7x Add '-7x' to each side of the equation. 20 + 7x + -7x = 15 + 7x + -7x Combine like terms: 7x + -7x = 0 20 + 0 = 15 + 7x + -7x 20 = 15 + 7x + -7x Combine like terms: 7x + -7x = 0 20 = 15 + 0 20 = 15 Solving 20 = 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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