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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 = 3x -2 + 3x = 21 Solving -2 + 3x = 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 + 3x = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 3x = 21 + 2 3x = 21 + 2 Combine like terms: 21 + 2 = 23 3x = 23 Divide each side by '3'. x = 7.666666667 Simplifying x = 7.666666667
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