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Simplifying 5x + 4y = 21 Solving 5x + 4y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4y' to each side of the equation. 5x + 4y + -4y = 21 + -4y Combine like terms: 4y + -4y = 0 5x + 0 = 21 + -4y 5x = 21 + -4y Divide each side by '5'. x = 4.2 + -0.8y Simplifying x = 4.2 + -0.8y
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