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Simplifying 9x + -4x + 7 = 21 + 5x Reorder the terms: 7 + 9x + -4x = 21 + 5x Combine like terms: 9x + -4x = 5x 7 + 5x = 21 + 5x Add '-5x' to each side of the equation. 7 + 5x + -5x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 7 + 0 = 21 + 5x + -5x 7 = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 7 = 21 + 0 7 = 21 Solving 7 = 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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