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Simplifying 12x + -3 = 21x + 3 Reorder the terms: -3 + 12x = 21x + 3 Reorder the terms: -3 + 12x = 3 + 21x Solving -3 + 12x = 3 + 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 + 12x + -21x = 3 + 21x + -21x Combine like terms: 12x + -21x = -9x -3 + -9x = 3 + 21x + -21x Combine like terms: 21x + -21x = 0 -3 + -9x = 3 + 0 -3 + -9x = 3 Add '3' to each side of the equation. -3 + 3 + -9x = 3 + 3 Combine like terms: -3 + 3 = 0 0 + -9x = 3 + 3 -9x = 3 + 3 Combine like terms: 3 + 3 = 6 -9x = 6 Divide each side by '-9'. x = -0.6666666667 Simplifying x = -0.6666666667
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