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Simplifying 7 + 2(4x + 3) = 21 Reorder the terms: 7 + 2(3 + 4x) = 21 7 + (3 * 2 + 4x * 2) = 21 7 + (6 + 8x) = 21 Combine like terms: 7 + 6 = 13 13 + 8x = 21 Solving 13 + 8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 8x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 8x = 21 + -13 8x = 21 + -13 Combine like terms: 21 + -13 = 8 8x = 8 Divide each side by '8'. x = 1 Simplifying x = 1
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