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Simplifying 21x + -100 = x Reorder the terms: -100 + 21x = x Solving -100 + 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. -100 + 21x + -1x = x + -1x Combine like terms: 21x + -1x = 20x -100 + 20x = x + -1x Combine like terms: x + -1x = 0 -100 + 20x = 0 Add '100' to each side of the equation. -100 + 100 + 20x = 0 + 100 Combine like terms: -100 + 100 = 0 0 + 20x = 0 + 100 20x = 0 + 100 Combine like terms: 0 + 100 = 100 20x = 100 Divide each side by '20'. x = 5 Simplifying x = 5
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