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Simplifying 5x + 3(2x + 7) = 21 Reorder the terms: 5x + 3(7 + 2x) = 21 5x + (7 * 3 + 2x * 3) = 21 5x + (21 + 6x) = 21 Reorder the terms: 21 + 5x + 6x = 21 Combine like terms: 5x + 6x = 11x 21 + 11x = 21 Add '-21' to each side of the equation. 21 + -21 + 11x = 21 + -21 Combine like terms: 21 + -21 = 0 0 + 11x = 21 + -21 11x = 21 + -21 Combine like terms: 21 + -21 = 0 11x = 0 Solving 11x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '11'. x = 0 Simplifying x = 0
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