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Simplifying 5x + 9y = -21 Solving 5x + 9y = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9y' to each side of the equation. 5x + 9y + -9y = -21 + -9y Combine like terms: 9y + -9y = 0 5x + 0 = -21 + -9y 5x = -21 + -9y Divide each side by '5'. x = -4.2 + -1.8y Simplifying x = -4.2 + -1.8y
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