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Simplifying -1 + -1x = x + -21 Reorder the terms: -1 + -1x = -21 + x Solving -1 + -1x = -21 + 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. -1 + -1x + -1x = -21 + x + -1x Combine like terms: -1x + -1x = -2x -1 + -2x = -21 + x + -1x Combine like terms: x + -1x = 0 -1 + -2x = -21 + 0 -1 + -2x = -21 Add '1' to each side of the equation. -1 + 1 + -2x = -21 + 1 Combine like terms: -1 + 1 = 0 0 + -2x = -21 + 1 -2x = -21 + 1 Combine like terms: -21 + 1 = -20 -2x = -20 Divide each side by '-2'. x = 10 Simplifying x = 10
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