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Simplifying 21x + -9 = 3x + 27 Reorder the terms: -9 + 21x = 3x + 27 Reorder the terms: -9 + 21x = 27 + 3x Solving -9 + 21x = 27 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -9 + 21x + -3x = 27 + 3x + -3x Combine like terms: 21x + -3x = 18x -9 + 18x = 27 + 3x + -3x Combine like terms: 3x + -3x = 0 -9 + 18x = 27 + 0 -9 + 18x = 27 Add '9' to each side of the equation. -9 + 9 + 18x = 27 + 9 Combine like terms: -9 + 9 = 0 0 + 18x = 27 + 9 18x = 27 + 9 Combine like terms: 27 + 9 = 36 18x = 36 Divide each side by '18'. x = 2 Simplifying x = 2
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