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Simplifying 21x + -5 + -17x + 2 = 16x + -7 + -12x + 16 Reorder the terms: -5 + 2 + 21x + -17x = 16x + -7 + -12x + 16 Combine like terms: -5 + 2 = -3 -3 + 21x + -17x = 16x + -7 + -12x + 16 Combine like terms: 21x + -17x = 4x -3 + 4x = 16x + -7 + -12x + 16 Reorder the terms: -3 + 4x = -7 + 16 + 16x + -12x Combine like terms: -7 + 16 = 9 -3 + 4x = 9 + 16x + -12x Combine like terms: 16x + -12x = 4x -3 + 4x = 9 + 4x Add '-4x' to each side of the equation. -3 + 4x + -4x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 -3 + 0 = 9 + 4x + -4x -3 = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 -3 = 9 + 0 -3 = 9 Solving -3 = 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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