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