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Simplifying 21x + -9 + -17x + 2 = 15x + -5 + -11x + 17 Reorder the terms: -9 + 2 + 21x + -17x = 15x + -5 + -11x + 17 Combine like terms: -9 + 2 = -7 -7 + 21x + -17x = 15x + -5 + -11x + 17 Combine like terms: 21x + -17x = 4x -7 + 4x = 15x + -5 + -11x + 17 Reorder the terms: -7 + 4x = -5 + 17 + 15x + -11x Combine like terms: -5 + 17 = 12 -7 + 4x = 12 + 15x + -11x Combine like terms: 15x + -11x = 4x -7 + 4x = 12 + 4x Add '-4x' to each side of the equation. -7 + 4x + -4x = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -7 + 0 = 12 + 4x + -4x -7 = 12 + 4x + -4x Combine like terms: 4x + -4x = 0 -7 = 12 + 0 -7 = 12 Solving -7 = 12 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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