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Simplifying -9y2 + 3xy + 21 = 0 Reorder the terms: 21 + 3xy + -9y2 = 0 Solving 21 + 3xy + -9y2 = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 3xy + -21 + -9y2 = 0 + -21 Reorder the terms: 21 + -21 + 3xy + -9y2 = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3xy + -9y2 = 0 + -21 3xy + -9y2 = 0 + -21 Combine like terms: 0 + -21 = -21 3xy + -9y2 = -21 Add '9y2' to each side of the equation. 3xy + -9y2 + 9y2 = -21 + 9y2 Combine like terms: -9y2 + 9y2 = 0 3xy + 0 = -21 + 9y2 3xy = -21 + 9y2 Divide each side by '3y'. x = -7y-1 + 3y Simplifying x = -7y-1 + 3y
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