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Simplifying 21x + -27 = 18x Reorder the terms: -27 + 21x = 18x Solving -27 + 21x = 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. -27 + 21x + -18x = 18x + -18x Combine like terms: 21x + -18x = 3x -27 + 3x = 18x + -18x Combine like terms: 18x + -18x = 0 -27 + 3x = 0 Add '27' to each side of the equation. -27 + 27 + 3x = 0 + 27 Combine like terms: -27 + 27 = 0 0 + 3x = 0 + 27 3x = 0 + 27 Combine like terms: 0 + 27 = 27 3x = 27 Divide each side by '3'. x = 9 Simplifying x = 9
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