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Simplifying 13x + 21 + -9x = 4x + 12 + -3 Reorder the terms: 21 + 13x + -9x = 4x + 12 + -3 Combine like terms: 13x + -9x = 4x 21 + 4x = 4x + 12 + -3 Reorder the terms: 21 + 4x = 12 + -3 + 4x Combine like terms: 12 + -3 = 9 21 + 4x = 9 + 4x Add '-4x' to each side of the equation. 21 + 4x + -4x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + 0 = 9 + 4x + -4x 21 = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 21 = 9 + 0 21 = 9 Solving 21 = 9 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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