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Simplifying Xy + 3x + y2 = 21 Reorder the terms: 3x + yX + y2 = 21 Solving 3x + yX + y2 = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1yX' to each side of the equation. 3x + yX + -1yX + y2 = 21 + -1yX Combine like terms: yX + -1yX = 0 3x + 0 + y2 = 21 + -1yX 3x + y2 = 21 + -1yX Add '-1y2' to each side of the equation. 3x + y2 + -1y2 = 21 + -1yX + -1y2 Combine like terms: y2 + -1y2 = 0 3x + 0 = 21 + -1yX + -1y2 3x = 21 + -1yX + -1y2 Divide each side by '3'. x = 7 + -0.3333333333yX + -0.3333333333y2 Simplifying x = 7 + -0.3333333333yX + -0.3333333333y2
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