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Simplifying 21x + -4 = 9x + 3 Reorder the terms: -4 + 21x = 9x + 3 Reorder the terms: -4 + 21x = 3 + 9x Solving -4 + 21x = 3 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -4 + 21x + -9x = 3 + 9x + -9x Combine like terms: 21x + -9x = 12x -4 + 12x = 3 + 9x + -9x Combine like terms: 9x + -9x = 0 -4 + 12x = 3 + 0 -4 + 12x = 3 Add '4' to each side of the equation. -4 + 4 + 12x = 3 + 4 Combine like terms: -4 + 4 = 0 0 + 12x = 3 + 4 12x = 3 + 4 Combine like terms: 3 + 4 = 7 12x = 7 Divide each side by '12'. x = 0.5833333333 Simplifying x = 0.5833333333
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