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Simplifying 3x + -3 = 21x + 9 Reorder the terms: -3 + 3x = 21x + 9 Reorder the terms: -3 + 3x = 9 + 21x Solving -3 + 3x = 9 + 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. -3 + 3x + -21x = 9 + 21x + -21x Combine like terms: 3x + -21x = -18x -3 + -18x = 9 + 21x + -21x Combine like terms: 21x + -21x = 0 -3 + -18x = 9 + 0 -3 + -18x = 9 Add '3' to each side of the equation. -3 + 3 + -18x = 9 + 3 Combine like terms: -3 + 3 = 0 0 + -18x = 9 + 3 -18x = 9 + 3 Combine like terms: 9 + 3 = 12 -18x = 12 Divide each side by '-18'. x = -0.6666666667 Simplifying x = -0.6666666667
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