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Simplifying x + (x + 4) = 2x + -1 Reorder the terms: x + (4 + x) = 2x + -1 Remove parenthesis around (4 + x) x + 4 + x = 2x + -1 Reorder the terms: 4 + x + x = 2x + -1 Combine like terms: x + x = 2x 4 + 2x = 2x + -1 Reorder the terms: 4 + 2x = -1 + 2x Add '-2x' to each side of the equation. 4 + 2x + -2x = -1 + 2x + -2x Combine like terms: 2x + -2x = 0 4 + 0 = -1 + 2x + -2x 4 = -1 + 2x + -2x Combine like terms: 2x + -2x = 0 4 = -1 + 0 4 = -1 Solving 4 = -1 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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