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Simplifying x + -1(21 + -2x) = 6 x + (21 * -1 + -2x * -1) = 6 x + (-21 + 2x) = 6 Reorder the terms: -21 + x + 2x = 6 Combine like terms: x + 2x = 3x -21 + 3x = 6 Solving -21 + 3x = 6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = 6 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 6 + 21 3x = 6 + 21 Combine like terms: 6 + 21 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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