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