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Simplifying 4x + -5y = 20 Solving 4x + -5y = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5y' to each side of the equation. 4x + -5y + 5y = 20 + 5y Combine like terms: -5y + 5y = 0 4x + 0 = 20 + 5y 4x = 20 + 5y Divide each side by '4'. x = 5 + 1.25y Simplifying x = 5 + 1.25y

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