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Simplifying x + -4y + -20 = 0 Reorder the terms: -20 + x + -4y = 0 Solving -20 + x + -4y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + x + 20 + -4y = 0 + 20 Reorder the terms: -20 + 20 + x + -4y = 0 + 20 Combine like terms: -20 + 20 = 0 0 + x + -4y = 0 + 20 x + -4y = 0 + 20 Combine like terms: 0 + 20 = 20 x + -4y = 20 Add '4y' to each side of the equation. x + -4y + 4y = 20 + 4y Combine like terms: -4y + 4y = 0 x + 0 = 20 + 4y x = 20 + 4y Simplifying x = 20 + 4y

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