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Simplifying 9x + -4 = 21x + 4 Reorder the terms: -4 + 9x = 21x + 4 Reorder the terms: -4 + 9x = 4 + 21x Solving -4 + 9x = 4 + 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. -4 + 9x + -21x = 4 + 21x + -21x Combine like terms: 9x + -21x = -12x -4 + -12x = 4 + 21x + -21x Combine like terms: 21x + -21x = 0 -4 + -12x = 4 + 0 -4 + -12x = 4 Add '4' to each side of the equation. -4 + 4 + -12x = 4 + 4 Combine like terms: -4 + 4 = 0 0 + -12x = 4 + 4 -12x = 4 + 4 Combine like terms: 4 + 4 = 8 -12x = 8 Divide each side by '-12'. x = -0.6666666667 Simplifying x = -0.6666666667
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