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Simplifying 21 = 2(x + -1) + -1x Reorder the terms: 21 = 2(-1 + x) + -1x 21 = (-1 * 2 + x * 2) + -1x 21 = (-2 + 2x) + -1x Combine like terms: 2x + -1x = 1x 21 = -2 + 1x Solving 21 = -2 + 1x 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. 21 + -1x = -2 + 1x + -1x Combine like terms: 1x + -1x = 0 21 + -1x = -2 + 0 21 + -1x = -2 Add '-21' to each side of the equation. 21 + -21 + -1x = -2 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = -2 + -21 -1x = -2 + -21 Combine like terms: -2 + -21 = -23 -1x = -23 Divide each side by '-1'. x = 23 Simplifying x = 23
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