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Simplifying 21x + -4 = 12x + -8 Reorder the terms: -4 + 21x = 12x + -8 Reorder the terms: -4 + 21x = -8 + 12x Solving -4 + 21x = -8 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. -4 + 21x + -12x = -8 + 12x + -12x Combine like terms: 21x + -12x = 9x -4 + 9x = -8 + 12x + -12x Combine like terms: 12x + -12x = 0 -4 + 9x = -8 + 0 -4 + 9x = -8 Add '4' to each side of the equation. -4 + 4 + 9x = -8 + 4 Combine like terms: -4 + 4 = 0 0 + 9x = -8 + 4 9x = -8 + 4 Combine like terms: -8 + 4 = -4 9x = -4 Divide each side by '9'. x = -0.4444444444 Simplifying x = -0.4444444444
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