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Simplifying 21x + 1 = 18x + 13 Reorder the terms: 1 + 21x = 18x + 13 Reorder the terms: 1 + 21x = 13 + 18x Solving 1 + 21x = 13 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 1 + 21x + -18x = 13 + 18x + -18x Combine like terms: 21x + -18x = 3x 1 + 3x = 13 + 18x + -18x Combine like terms: 18x + -18x = 0 1 + 3x = 13 + 0 1 + 3x = 13 Add '-1' to each side of the equation. 1 + -1 + 3x = 13 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 13 + -1 3x = 13 + -1 Combine like terms: 13 + -1 = 12 3x = 12 Divide each side by '3'. x = 4 Simplifying x = 4
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