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