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Simplifying 21x + -21 = 3x + 6 Reorder the terms: -21 + 21x = 3x + 6 Reorder the terms: -21 + 21x = 6 + 3x Solving -21 + 21x = 6 + 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. -21 + 21x + -3x = 6 + 3x + -3x Combine like terms: 21x + -3x = 18x -21 + 18x = 6 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 18x = 6 + 0 -21 + 18x = 6 Add '21' to each side of the equation. -21 + 21 + 18x = 6 + 21 Combine like terms: -21 + 21 = 0 0 + 18x = 6 + 21 18x = 6 + 21 Combine like terms: 6 + 21 = 27 18x = 27 Divide each side by '18'. x = 1.5 Simplifying x = 1.5
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