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Simplifying 7(7 + 3x) = 133 (7 * 7 + 3x * 7) = 133 (49 + 21x) = 133 Solving 49 + 21x = 133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49' to each side of the equation. 49 + -49 + 21x = 133 + -49 Combine like terms: 49 + -49 = 0 0 + 21x = 133 + -49 21x = 133 + -49 Combine like terms: 133 + -49 = 84 21x = 84 Divide each side by '21'. x = 4 Simplifying x = 4
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