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Simplifying 21x + 1 = 18 + 13 Reorder the terms: 1 + 21x = 18 + 13 Combine like terms: 18 + 13 = 31 1 + 21x = 31 Solving 1 + 21x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 21x = 31 + -1 Combine like terms: 1 + -1 = 0 0 + 21x = 31 + -1 21x = 31 + -1 Combine like terms: 31 + -1 = 30 21x = 30 Divide each side by '21'. x = 1.428571429 Simplifying x = 1.428571429
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