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Simplifying 3x + 21 + -1x = 20 Reorder the terms: 21 + 3x + -1x = 20 Combine like terms: 3x + -1x = 2x 21 + 2x = 20 Solving 21 + 2x = 20 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 + 2x = 20 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 20 + -21 2x = 20 + -21 Combine like terms: 20 + -21 = -1 2x = -1 Divide each side by '2'. x = -0.5 Simplifying x = -0.5
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