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Simplifying x + 2x + 7 = 3x + -7 Reorder the terms: 7 + x + 2x = 3x + -7 Combine like terms: x + 2x = 3x 7 + 3x = 3x + -7 Reorder the terms: 7 + 3x = -7 + 3x Add '-3x' to each side of the equation. 7 + 3x + -3x = -7 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + 0 = -7 + 3x + -3x 7 = -7 + 3x + -3x Combine like terms: 3x + -3x = 0 7 = -7 + 0 7 = -7 Solving 7 = -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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