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Simplifying 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 = 1x -21 + 1x = 31 Solving -21 + 1x = 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 + 1x = 31 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 31 + 21 1x = 31 + 21 Combine like terms: 31 + 21 = 52 1x = 52 Divide each side by '1'. x = 52 Simplifying x = 52
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