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Simplifying 2(3 + 4x) + -1 = 21 (3 * 2 + 4x * 2) + -1 = 21 (6 + 8x) + -1 = 21 Reorder the terms: 6 + -1 + 8x = 21 Combine like terms: 6 + -1 = 5 5 + 8x = 21 Solving 5 + 8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 8x = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 8x = 21 + -5 8x = 21 + -5 Combine like terms: 21 + -5 = 16 8x = 16 Divide each side by '8'. x = 2 Simplifying x = 2
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