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Simplifying 20 + -2x + 1 = 9 Reorder the terms: 20 + 1 + -2x = 9 Combine like terms: 20 + 1 = 21 21 + -2x = 9 Solving 21 + -2x = 9 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 = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 9 + -21 -2x = 9 + -21 Combine like terms: 9 + -21 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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