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Simplifying 3x + 21 = 2x + -18 + x Reorder the terms: 21 + 3x = 2x + -18 + x Reorder the terms: 21 + 3x = -18 + 2x + x Combine like terms: 2x + x = 3x 21 + 3x = -18 + 3x Add '-3x' to each side of the equation. 21 + 3x + -3x = -18 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + 0 = -18 + 3x + -3x 21 = -18 + 3x + -3x Combine like terms: 3x + -3x = 0 21 = -18 + 0 21 = -18 Solving 21 = -18 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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