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Simplifying -7x + 21 = -2x + 6 + -5x Reorder the terms: 21 + -7x = -2x + 6 + -5x Reorder the terms: 21 + -7x = 6 + -2x + -5x Combine like terms: -2x + -5x = -7x 21 + -7x = 6 + -7x Add '7x' to each side of the equation. 21 + -7x + 7x = 6 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 0 = 6 + -7x + 7x 21 = 6 + -7x + 7x Combine like terms: -7x + 7x = 0 21 = 6 + 0 21 = 6 Solving 21 = 6 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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