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Simplifying x + -2(x + -1) = 21 Reorder the terms: x + -2(-1 + x) = 21 x + (-1 * -2 + x * -2) = 21 x + (2 + -2x) = 21 Reorder the terms: 2 + x + -2x = 21 Combine like terms: x + -2x = -1x 2 + -1x = 21 Solving 2 + -1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 21 + -2 -1x = 21 + -2 Combine like terms: 21 + -2 = 19 -1x = 19 Divide each side by '-1'. x = -19 Simplifying x = -19
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