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Simplifying 21x2 + 12x = 21x2 + 12z + -5 Reorder the terms: 12x + 21x2 = 21x2 + 12z + -5 Reorder the terms: 12x + 21x2 = -5 + 21x2 + 12z Add '-21x2' to each side of the equation. 12x + 21x2 + -21x2 = -5 + 21x2 + -21x2 + 12z Combine like terms: 21x2 + -21x2 = 0 12x + 0 = -5 + 21x2 + -21x2 + 12z 12x = -5 + 21x2 + -21x2 + 12z Combine like terms: 21x2 + -21x2 = 0 12x = -5 + 0 + 12z 12x = -5 + 12z Solving 12x = -5 + 12z Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '12'. x = -0.4166666667 + z Simplifying x = -0.4166666667 + z
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