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Simplifying x + -4y2 + -20y + -21 = 0 Reorder the terms: -21 + x + -20y + -4y2 = 0 Solving -21 + x + -20y + -4y2 = 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 + x + -20y + 21 + -4y2 = 0 + 21 Reorder the terms: -21 + 21 + x + -20y + -4y2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + x + -20y + -4y2 = 0 + 21 x + -20y + -4y2 = 0 + 21 Combine like terms: 0 + 21 = 21 x + -20y + -4y2 = 21 Add '20y' to each side of the equation. x + -20y + 20y + -4y2 = 21 + 20y Combine like terms: -20y + 20y = 0 x + 0 + -4y2 = 21 + 20y x + -4y2 = 21 + 20y Add '4y2' to each side of the equation. x + -4y2 + 4y2 = 21 + 20y + 4y2 Combine like terms: -4y2 + 4y2 = 0 x + 0 = 21 + 20y + 4y2 x = 21 + 20y + 4y2 Simplifying x = 21 + 20y + 4y2
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