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Simplifying 2[x + (21)] = 48 2[x + 21] = 48 Reorder the terms: 2[21 + x] = 48 [21 * 2 + x * 2] = 48 [42 + 2x] = 48 Solving 42 + 2x = 48 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 2x = 48 + -42 Combine like terms: 42 + -42 = 0 0 + 2x = 48 + -42 2x = 48 + -42 Combine like terms: 48 + -42 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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