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Simplifying 0.4x + 0.9y = 3.6 Solving 0.4x + 0.9y = 3.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9y' to each side of the equation. 0.4x + 0.9y + -0.9y = 3.6 + -0.9y Combine like terms: 0.9y + -0.9y = 0.0 0.4x + 0.0 = 3.6 + -0.9y 0.4x = 3.6 + -0.9y Divide each side by '0.4'. x = 9 + -2.25y Simplifying x = 9 + -2.25y

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