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Simplifying 2x + -1(-1)(21 + x) = -31 Multiply -1 * -1 2x + 1(21 + x) = -31 2x + (21 * 1 + x * 1) = -31 2x + (21 + 1x) = -31 Reorder the terms: 21 + 2x + 1x = -31 Combine like terms: 2x + 1x = 3x 21 + 3x = -31 Solving 21 + 3x = -31 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 = -31 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -31 + -21 3x = -31 + -21 Combine like terms: -31 + -21 = -52 3x = -52 Divide each side by '3'. x = -17.33333333 Simplifying x = -17.33333333
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