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Simplifying 3x + -1(2x + 1) = 20 Reorder the terms: 3x + -1(1 + 2x) = 20 3x + (1 * -1 + 2x * -1) = 20 3x + (-1 + -2x) = 20 Reorder the terms: -1 + 3x + -2x = 20 Combine like terms: 3x + -2x = 1x -1 + 1x = 20 Solving -1 + 1x = 20 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 = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 1x = 20 + 1 1x = 20 + 1 Combine like terms: 20 + 1 = 21 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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