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Simplifying -21 = 2x + -1 Reorder the terms: -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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