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Simplifying 4x + 15 = 4x + -20 Reorder the terms: 15 + 4x = 4x + -20 Reorder the terms: 15 + 4x = -20 + 4x Add '-4x' to each side of the equation. 15 + 4x + -4x = -20 + 4x + -4x Combine like terms: 4x + -4x = 0 15 + 0 = -20 + 4x + -4x 15 = -20 + 4x + -4x Combine like terms: 4x + -4x = 0 15 = -20 + 0 15 = -20 Solving 15 = -20 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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