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Simplifying 5x + 3(3x + 7) = 91 Reorder the terms: 5x + 3(7 + 3x) = 91 5x + (7 * 3 + 3x * 3) = 91 5x + (21 + 9x) = 91 Reorder the terms: 21 + 5x + 9x = 91 Combine like terms: 5x + 9x = 14x 21 + 14x = 91 Solving 21 + 14x = 91 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 14x = 91 + -21 Combine like terms: 21 + -21 = 0 0 + 14x = 91 + -21 14x = 91 + -21 Combine like terms: 91 + -21 = 70 14x = 70 Divide each side by '14'. x = 5 Simplifying x = 5
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