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Simplifying 1x + -81 + -21x = -1 Reorder the terms: -81 + 1x + -21x = -1 Combine like terms: 1x + -21x = -20x -81 + -20x = -1 Solving -81 + -20x = -1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + -20x = -1 + 81 Combine like terms: -81 + 81 = 0 0 + -20x = -1 + 81 -20x = -1 + 81 Combine like terms: -1 + 81 = 80 -20x = 80 Divide each side by '-20'. x = -4 Simplifying x = -4
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