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Simplifying 21x + -42 = 21 Reorder the terms: -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 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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