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