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Simplifying (21x + 42) = 21 Reorder the terms: (42 + 21x) = 21 Remove parenthesis around (42 + 21x) 42 + 21x = 21 Solving 42 + 21x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 21x = 21 + -42 Combine like terms: 42 + -42 = 0 0 + 21x = 21 + -42 21x = 21 + -42 Combine like terms: 21 + -42 = -21 21x = -21 Divide each side by '21'. x = -1 Simplifying x = -1
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