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Simplifying x = 3x + 21 Reorder the terms: x = 21 + 3x Solving x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. x + -3x = 21 + 3x + -3x Combine like terms: x + -3x = -2x -2x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 -2x = 21 + 0 -2x = 21 Divide each side by '-2'. x = -10.5 Simplifying x = -10.5
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