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Simplifying 21x + -25 = 20x + -45 Reorder the terms: -25 + 21x = 20x + -45 Reorder the terms: -25 + 21x = -45 + 20x Solving -25 + 21x = -45 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -25 + 21x + -20x = -45 + 20x + -20x Combine like terms: 21x + -20x = 1x -25 + 1x = -45 + 20x + -20x Combine like terms: 20x + -20x = 0 -25 + 1x = -45 + 0 -25 + 1x = -45 Add '25' to each side of the equation. -25 + 25 + 1x = -45 + 25 Combine like terms: -25 + 25 = 0 0 + 1x = -45 + 25 1x = -45 + 25 Combine like terms: -45 + 25 = -20 1x = -20 Divide each side by '1'. x = -20 Simplifying x = -20
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