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Simplifying 1 + x + 3 = 15 + x Reorder the terms: 1 + 3 + x = 15 + x Combine like terms: 1 + 3 = 4 4 + x = 15 + x Add '-1x' to each side of the equation. 4 + x + -1x = 15 + x + -1x Combine like terms: x + -1x = 0 4 + 0 = 15 + x + -1x 4 = 15 + x + -1x Combine like terms: x + -1x = 0 4 = 15 + 0 4 = 15 Solving 4 = 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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