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Simplifying 3 + -1(2x + 1) = 21 Reorder the terms: 3 + -1(1 + 2x) = 21 3 + (1 * -1 + 2x * -1) = 21 3 + (-1 + -2x) = 21 Combine like terms: 3 + -1 = 2 2 + -2x = 21 Solving 2 + -2x = 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 + -2x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + -2x = 21 + -2 -2x = 21 + -2 Combine like terms: 21 + -2 = 19 -2x = 19 Divide each side by '-2'. x = -9.5 Simplifying x = -9.5
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