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Simplifying 7(3x + 21) = 210 Reorder the terms: 7(21 + 3x) = 210 (21 * 7 + 3x * 7) = 210 (147 + 21x) = 210 Solving 147 + 21x = 210 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-147' to each side of the equation. 147 + -147 + 21x = 210 + -147 Combine like terms: 147 + -147 = 0 0 + 21x = 210 + -147 21x = 210 + -147 Combine like terms: 210 + -147 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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