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