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Simplifying 3(7x + 7) = 210 Reorder the terms: 3(7 + 7x) = 210 (7 * 3 + 7x * 3) = 210 (21 + 21x) = 210 Solving 21 + 21x = 210 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 + 21x = 210 + -21 Combine like terms: 21 + -21 = 0 0 + 21x = 210 + -21 21x = 210 + -21 Combine like terms: 210 + -21 = 189 21x = 189 Divide each side by '21'. x = 9 Simplifying x = 9
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