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Simplifying x + (x + 1) + (x + 3) = 3x + 7 Reorder the terms: x + (1 + x) + (x + 3) = 3x + 7 Remove parenthesis around (1 + x) x + 1 + x + (x + 3) = 3x + 7 Reorder the terms: x + 1 + x + (3 + x) = 3x + 7 Remove parenthesis around (3 + x) x + 1 + x + 3 + x = 3x + 7 Reorder the terms: 1 + 3 + x + x + x = 3x + 7 Combine like terms: 1 + 3 = 4 4 + x + x + x = 3x + 7 Combine like terms: x + x = 2x 4 + 2x + x = 3x + 7 Combine like terms: 2x + x = 3x 4 + 3x = 3x + 7 Reorder the terms: 4 + 3x = 7 + 3x Add '-3x' to each side of the equation. 4 + 3x + -3x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 4 + 0 = 7 + 3x + -3x 4 = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 4 = 7 + 0 4 = 7 Solving 4 = 7 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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