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Simplifying -21 = -5x + 3x + -1 Reorder the terms: -21 = -1 + -5x + 3x Combine like terms: -5x + 3x = -2x -21 = -1 + -2x Solving -21 = -1 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -21 + 2x = -1 + -2x + 2x Combine like terms: -2x + 2x = 0 -21 + 2x = -1 + 0 -21 + 2x = -1 Add '21' to each side of the equation. -21 + 21 + 2x = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = -1 + 21 2x = -1 + 21 Combine like terms: -1 + 21 = 20 2x = 20 Divide each side by '2'. x = 10 Simplifying x = 10
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