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Simplifying 2x + -21 + x = -31 Reorder the terms: -21 + 2x + x = -31 Combine like terms: 2x + x = 3x -21 + 3x = -31 Solving -21 + 3x = -31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = -31 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = -31 + 21 3x = -31 + 21 Combine like terms: -31 + 21 = -10 3x = -10 Divide each side by '3'. x = -3.333333333 Simplifying x = -3.333333333
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