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