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Simplifying 5x + -3y = 21 Solving 5x + -3y = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3y' to each side of the equation. 5x + -3y + 3y = 21 + 3y Combine like terms: -3y + 3y = 0 5x + 0 = 21 + 3y 5x = 21 + 3y Divide each side by '5'. x = 4.2 + 0.6y Simplifying x = 4.2 + 0.6y

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