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Simplifying 21x + -40 = x Reorder the terms: -40 + 21x = x Solving -40 + 21x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -40 + 21x + -1x = x + -1x Combine like terms: 21x + -1x = 20x -40 + 20x = x + -1x Combine like terms: x + -1x = 0 -40 + 20x = 0 Add '40' to each side of the equation. -40 + 40 + 20x = 0 + 40 Combine like terms: -40 + 40 = 0 0 + 20x = 0 + 40 20x = 0 + 40 Combine like terms: 0 + 40 = 40 20x = 40 Divide each side by '20'. x = 2 Simplifying x = 2
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