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Simplifying 3x + -1(2x + 1) = 21 Reorder the terms: 3x + -1(1 + 2x) = 21 3x + (1 * -1 + 2x * -1) = 21 3x + (-1 + -2x) = 21 Reorder the terms: -1 + 3x + -2x = 21 Combine like terms: 3x + -2x = 1x -1 + 1x = 21 Solving -1 + 1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1x = 21 + 1 Combine like terms: -1 + 1 = 0 0 + 1x = 21 + 1 1x = 21 + 1 Combine like terms: 21 + 1 = 22 1x = 22 Divide each side by '1'. x = 22 Simplifying x = 22
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