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Simplifying 2x + -9 + -20 = 21 Reorder the terms: -9 + -20 + 2x = 21 Combine like terms: -9 + -20 = -29 -29 + 2x = 21 Solving -29 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '29' to each side of the equation. -29 + 29 + 2x = 21 + 29 Combine like terms: -29 + 29 = 0 0 + 2x = 21 + 29 2x = 21 + 29 Combine like terms: 21 + 29 = 50 2x = 50 Divide each side by '2'. x = 25 Simplifying x = 25
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