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Simplifying 2x + 5x + -3 = 7x + -21 Reorder the terms: -3 + 2x + 5x = 7x + -21 Combine like terms: 2x + 5x = 7x -3 + 7x = 7x + -21 Reorder the terms: -3 + 7x = -21 + 7x Add '-7x' to each side of the equation. -3 + 7x + -7x = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 -3 + 0 = -21 + 7x + -7x -3 = -21 + 7x + -7x Combine like terms: 7x + -7x = 0 -3 = -21 + 0 -3 = -21 Solving -3 = -21 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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